Chemoselective Reduction of α-keto Amides by Nickel Catalyst
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- Πέρσις Αγγελοπούλου
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1 Electronic Supplementary Material (ESI) for ChemComm. This journal is The Royal Society of Chemistry 2014 SUPPRTIG IFRMATI Chemoselective Reduction of α-keto Amides by ickel Catalyst for. Chary Mamillapalli and G. Sekar* Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil adu , India Table of contents ptimization Table 2 General considerations 3 General experimental procedure for synthesis of -keto amides 3 and their spectral data General experimental procedure for chemo selective reduction 5 of -keto amides and their spectral data General experimental procedure for complete reduction 8 of -keto amides and their spectral data References 11 1 and 13 C spectra for all compounds 12 1
2 Table 1: ptimization of ligands and nickel salts in the reduction of α-keto amides a i salt (5 mol %) Ligand (5 mol %) (Et) 3 Si (2 equiv.) TF, rt, 48 h Entry Ligand ickel salt Yiled (%) L1 L2 L3 L4 L5 L6 L7 L8 L9 L2 L2 L2 L2 L2 L2 i(ac) 2 i(ac) 2 i(ac) 2 i(ac) 2 i(ac) 2 i(ac) 2 i(ac) 2 i(ac) 2 i(ac) 2 icl 2 ibr 2 i(acac) 2 i(ac) icl ibr a Reaction condition. 0.5 mmol of 1a in TF. b Isolated yield L1 L2 L3 L4 L5 L6 L7 L8 L9 Figure 1: Ligands screened for the reduction of α-ketoamides 2
3 General considerations ickel(ii) acetate (98% pure), TMEDA (99% pure), DBU (99% pure), aac (99% pure), atbu (97% pure) and KtBu (98% pure) were purchased from SpectrochemPvt. Ltd. India. ydrosilanes, nickel(ii) bromide (98% pure), nickel(ii) chloride (98%), DABC (>99% pure) and 1,10-phenanthroline ( 99% pure) werepurchesed from Sigma aldrich chemicals, USA. Thinlayer chromatography (TLC) was performed using Merck silica gel 60 F254 precoated plates (0.25 mm) and visualized by UV fluorescence quenching. Silica gel for column chromatography (particle size mesh) was purchased from SRL India. 1 and 13 C MR spectra were recorded on a Bruker 400 Mz instrument. 1 MR spectra were reported relative to residual CCl 3 ( 7.26 ppm) or DMS ( 2.50 ppm). 13 C MR were reported relative to CDCl 3 ( ppm) or DMS-d 6 ( ppm). FTIR spectra were recorded on ajascspectrometer and are reported in frequency of absorption (cm -1 ). igh resolution mass spectra (RMS) were recorded on Q-Tof Micro mass spectrometer. General experimental procedure for synthesis of -keto amides Thionyl chloride (0.3 ml, 4 mmol) was added dropwise to a stirred mixture of benzyl formic acid (0.300 g, 2 mmol) and Et 3 (0.5 ml, 4 mmol) in C 2 Cl 2 (10 ml) at 0 o C under nitrogen atmosphere. The stirring was continued for 20 min. and then a suspension of corresponding amine (2 mmol) in C 2 Cl 2 (10 ml) was added slowly to the reaction mixture at 0 o C under nitrogen flow. The stirring was continued in the room temperature and the completion of the reaction manitored through TLC. A saturated aqueous solution of ac 3 (20 ml) was added slowly under stirring to the reaction mixture. The organic layer separated, washed with water (3 15 ml) and evaporated under reduced pressure. The solid residue purified through silica gel cloumn chromatography. Spectral data for -keto amides -(4-acetylphenyl)-2-oxo-2-phenylacetamide C 3 RMS (m/z): [M+] + calcd for C , ; found, Green colure solid, mp = o C R f 0.36; (hexanes : ethyl acetate, 90:10 v/v): 1 MR (400 Mz, CDCl 3 ): 9.18 (bs, 1), 8.41 (d, J = 7.6 z, 2), 8.01 (d, J = 8.8 z, 2), 7.81 (d, J = 8.8 z, 2), 7.67 (t, J = 7.6 z, 1), 7.52 (t, J = 7.6 z, 2), 2.60 (s, 3); 13 C MR (100 Mz, CDCl 3 ): 197.0, 186.9, 159.1, 140.9, 135.0, 133.9, 132.9, 131.6, 130.0, 128.8, 119.5, 26.6; IR (neat) 3315, 1675, 1597, 1526, 1442, 1167 cm 1 ; -(3-benzoylphenyl)-2-oxo-2-phenylacetamide Yellow colure solid, mp = o C R f 0.35; (hexanes : ethyl acetate, 90:10 v/v): 1 MR (400 Mz, CDCl 3 ): 9.11 (bs, 1), 8.40 (dd, J = 7.2, 1.2 z, 2), 8.05 (dd, J = 9.8, 2.0 z, 2), 7.83 (dd, J = 7.2, 1.6 z, 2), 7.66 (t, J = 7.6, 1.2 z, 1), 7.60 (t, J = 7.6, 1.2 z, 2), (m, 5); 13 C MR (100 Mz, CDCl 3 ): 196.1, 187.2, 159.2, 138.8, 137.3, 136.9, 134.9, 133.0, 131.6, 130.2, 129.4, 128.8, 128.5, 126.9, 123.8, 121.4; IR (neat) 3252, 1676, 1636, 1591, 1552, 1169 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found,
4 -(3-acetylphenyl)-2-oxo-2-phenylacetamide C 3 Pale yellow colure solid, mp = o C R f 0.36; (hexanes : ethyl acetate, 90:10 v/v): 1 MR (400 Mz, CDCl 3 ): 9.12 (bs, 1), 8.42 (d, J = 7.6 z, 2), 8.28 (s, 1), 7.97 (d, J = 8.0 z, 1), 7.78 (t, J = 7.6 z, 1), 7.67 (t, J = 7.6 z, 1), (m, 3), 2.63 (s, 3); 13 C MR (100 Mz, CDCl 3 ): 197.6, 187.1, 159.2, 138.2, 137.3, 134.9, 133.1, 131.6, 129.7, 128.8, 125.2, 124.4, 119.8, 26.8; IR (neat) 3291, 1672, 1599, 1543, 1486, 1170 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, (4-(2-oxo-2-phenylacetamido)phenyl)benzamide Lite Green colure solid, mp = o C ; R f 0.35; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 :DMS-d 6, 8:2): 9.61 (bs, 1), 9.26 (bs, 1), 8.20 (dd, J = 17.2, 8.0 z, 2), 7.84 (t, J = 8.0 z, 2), (m, 4), (m, 1), (m, 5); 13 C MR (100 Mz, CDCl 3 :DMS-d 6, 8:2): 188.1, 165.8, 160.5, 135.6, 134.9, 134.1, 133.0, 132.9, 131.1, 130.5, 128.2, 128.0, 127.3, 120.7, 120.3; IR (KBr) 3989, 1659, 1537, 1402 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, ; found, (2-oxo-2-phenylacetamido)--phenylbenzamide Green colure solid, mp = o C ; R f 0.49; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, DMS-d 6 ): (bs, 1), (bs, 1), 8.07 (d, J = 7.6 z, 2), 8.01 (d, J = 8.0 z, 2), 7.89 (d, J = 8.0 z, 2), 7.78 (d, J = 8.0 z, 3), 7.62 (t, J = 7.6 z, 2) 7.35 (t, J = 7.6 z, 2) 7.10 (t, J = 7.2 z, 1); 13 C MR (100 Mz, DMS-d 6 ): 189.1, 164.8, 163.5, 140.5, 139.2, 134.9, 132.5, 130.7, 130.0, 129.1, 128.7, 128.6, 123.6, 120.4, 119.5; IR (KBr) 3333, 1671, 1650, 1595, 1525, 1180 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, ; found, chloro--methyl-4-(2-oxo-2-phenylacetamido)--phenylbenzamide C 3 Pale Green colure solid, mp = o C ; R f 0.55; (hexanes : ethyl acetate, 50:50 v/v): 1 MR (400 Mz, DMS-d 6 ): (bs, 1), 8.05 (d, J = 8.0, 2), 7.76 (dd, J = 8.0, 13.2 z, 2), 7.60 (t, J = 8.0 z, 2), 7.46 (bs, 1), 7.32 (t, J = 7.6 z, 2), (m, 4), 3.38 (s, 3); 13 C MR (100 Mz, DMS-d 6 ): 188.7, , 144.2, 135.0, 134.8, 134.2, 132.6, 130.0, 129.7, 129.3, 129.0, 127.7, 126.9, 125.9, 124.7, 38.0; IR (KBr) 3358, 1705, 1678, 1637, 1600, 1569, 1525, 1054 cm 1 ; RMS (m/z): [M+] + calcd for C Cl, ; found, Cl -benzyl-4-(2-oxo-2-phenylacetamido)benzamide Pale Green colure solid, mp = o C ; R f 0.55; (hexanes : ethyl acetate, 50:50 v/v): 1 MR (400 Mz, DMS-d 6 ): (bs, 1), 9.00 (t, J = 5.6 1), 8.06 (d, J = 7.6 z, 2), 7.94 (d, J = 8.0 z, 2), 7.83 (d, J = 8.0 z, 2), 7.77 (t, J = 7.2, 1), 7.62 (t, J = 7.6 z, 2), 7.32 (bs, 4), 7.25 (d, J = 4.4 z, 1), 4.49 (d, J = 5.6 z, 4
5 2); 13 C MR (100 Mz, DMS-d 6 ): 189.2, 165.6, 163.5, 140.3, 139.8, 135.0, 132.5, 130.2, 130.0, 129.1, 128.3, 127.3, 126.8, 126.3, 119.5, 42.7; IR (KBr) 3326, 1803, 1666, 1630, 1168 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, benzyl--methyl-4-(2-oxo-2-phenylacetamido)benzamide C 3 Pale Green colure solid, mp = o C ; R f 0.40; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, DMS-d 6 ): (bs, 1), 8.07 (dd, J = 1.2 z, 5.6 z, 2), 7.81 (d, J = 6.4 z, 2), 7.74 (t, J = 6.0 z, 1), 7.60 (t, J= 6.4 z, 2), 7.49 (d, J = 6.8 z, 2), 7.38 (t, J = 6.4 z, 2), 7.29 (t, J = 5.2 z,3), 4.62 (s, 2), 2.90 (s, 3); 13 C MR (100 Mz, DMS-d 6, temp. 90 o C): 188.6, 169.8, , 136.9, 134.0, 132.6, 132.2, 129.3, 128.4, 128.0, 127.2, 126.8, 126.6, 119.6, 51.7, 34.7; IR (KBr) 3069, 1694, 1688, 1682, 1632, 1612, 1071 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, General experimental procedure for chemo selective reduction of -keto amides A mixture of TMEDA (4 µl, mmol), nickel(ii)acetate (4.4 mg, mmol), aac (4 mg, 0.05 mmol) and α-keto amide (0.5 mmol) in 1.5 ml of dry TF were taken in a reaction tube fitted with rubber septum under nitrogen atmosphere. The reaction mixture was stirred at room temperature for 10 min., then PMS (120 µl, 2 mmol) was slowly added to the reaction mixture. Then the rubber septum was replaced with glass stopper under nitrogen flow and the reaction was stirred at 60 C. The progress of the reaction was monitered by TLC. After complete disappearance of starting material, 5 ml of 2 aq. a was added and the resulting reaction mixture was stirred for 30 min. Then the reaction mixture was extracted with ethyl acetate (2x10 ml). The combined organic layers was washed with brine, dried over anhydrous MgS 4, filtered off and the solvent was removed under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluents: hexanes-ethyl acetate, 80:20) to get pure -hydroxy amide. 2-ydroxy-, 2-diphenylacetamide 1 Spectral data for -hydroxy amides Colorless solid, mp = o C (Lit. 1 mp = o C); R f 0.56; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 8.11 (bs, 1), (m, 4), (m, 3), 7.32 (t, J= 7.6 z, 2), 7.12 (t, J = 7.6 z, 2), 5.19 (s, 1), 3.42 (s, 1); 13 C MR (100 Mz, CDCl 3 ): 170.1, 139.1, 137.2, 129.2, 129.1, , 127.0, 124.9, 120.0, 74.9; IR (KBr) 3675, 3409, 1655, 1602, 1544, 1191 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, ; found, ydroxy-2-phenyl--p-tolylacetamide 2 C 3 Colorless solid, mp = o C (Lit. 2 mp = o C); R f 0.46; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, CDCl 3 ): 8.00 (bs, 1), 7.48 (dd, J = 8.0 z, 1.6 z, 2), (m, 5), 7.11 (d, J = 8.4 z, 2), 5.17 (d, J = 3.2 z, 1), 3.44 (d, J = 3.2 z 1), 2.30 (s, 3); 13 C MR (100 Mz, CDCl 3 ): 169.9, 139.2, 134.6, 134.5, 129.7, 129.2, 129.1, 127.1, 120.0, 74.8, 21.0; IR (KBr) 3322, 1646, 1602, 1546, 1527, 1495 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found,
6 2-ydroxy--(naphthalen-1-yl)-2-phenylacetamide Colorles solid, mp = o C ; R f 0.55; (hexanes : ethyl acetate, 90:10 v/v): 1 MR (400 Mz, CDCl 3 ): 8.72 (bs, 1), 7.96 (d, J= 7.6, 1), 7.84 (d, J = 5.2 z, 1), 7.67 (d, J= 8.4 z, 2), 7.64 (d, J= 3.2 z 1), (m, 8), 5.26 (d, J= 3.2 z, 1), 3.92 (d, J= 3.2 z, 1); 13 C MR (100 Mz, CDCl 3 ): 171.1, 139.3, 134.1, 131.5, 129.0, 128.9, 126.9, 126.8, 126.6, 126.1, 126.0, 125.8, 120.3, 120.1, 74.9; IR (KBr) 3360, 3265, 1659, 1592, 1523, 1514, 1497 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, ydroxy--(4-methoxyphenyl)-2-phenylacetamide 3 Colorless solid, mp = o C (Lit. 3 mp= o C); R f 0.34; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 8.01 (bs, 1), 7.48 (d, J = 7.2 z, 3), (m, 5), 6.84 (d, J = 2.8 z, 1), 5.17 (d, J = 2.8 z, 1), 3.77 (s, 3), 3.49 (d, J = 3.2 z, 1); 13 C MR (100 Mz, CDCl 3 ): 170.0, 156.8, 139.2, 130.3, 129.0, 128.9, 127.0, 121.7, 114.3, 74.7, 55.6; IR (KBr) 3655, 1644, 1599, 1556, 1545, 1192 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, C 3 2-ydroxy-2-(4-methoxyphenyl)--phenylacetamide 3 C Colorless solid, mp = o C; R f 0.32; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 8.25 (bs, 1), 7.51 (d, J= 7.6 z, 2), 7.35 (d, J = 8.4 z, 1), 7.30 (t, J= 8.4 z, 2), 7.11 (t, J = 7.6 z, 1), 6.89 (d, J= 8.4 z, 2), 5.07 (d, J = 2.8 z, 1), 3.79 (s, 1), 3.65 (d, J= 3.2 z, 1); 13 C MR (100 Mz, CDCl 3 ): 170.6, 160.0, 137.2, 131.3, 129.1, 128.3, 124.7, 119.9, 114.4, 74.3, 55.4; IR (KBr) 3359, 2923, 1662, 1602, 1530, 1523, 1513 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, ; found, (4-Cyanophenyl)-2-hydroxy-2-phenylacetamide Colorless solid, mp= o C; R f 0.37; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 8.53 (s, 1), 7.70 (d, J = 8.8 z 2), 7.61 (d, J = 8.8 z, 2), 7.49 (dd, J = 8.0, 1.6 z 2), (m, 3), 5.26 (d, J = 3.2 z, 1), 3.13 (d, J = 3.2 z, 2); 13 C MR (100 Mz, CDCl 3 ): 170.3, 141.3, 138.6, 133.5, 131.3, 129.3, 129.2, 126.9, 119.8, 119.6, 75.0; IR (KBr) 3289, 3109, 2227, 1744, 1703, 1667, 1604, 1597 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, C 2-ydroxy--(2-iodophenyl)-2-phenylacetamide I Colorless solid, mp = o C ; R f 0.35; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 8.57 (bs, 1), 8.22 (dd, J= 8.4, 1.2 z, 1), 7.76 (dd, J = 8.0,1.6 z, 1), 7.52 (d, J= 7.2 z, 2), (m, 3), (m, 1), 6.84 (td, J= 7.8, 0.8 z, 1), 5.21 (d, J = 1.2 z, 1), 3.69 (d, J = 2.4 z, 1); 13 C MR (100 Mz, CDCl 3 ): 170.6, 139.0, 138.0, 137.7, 129.4, 129.2, 129.1, 127.1, 126.4, 121.6, 89.8, 75.1; IR (KBr) 3445, 2958, 1731, 1183, 1067 cm 1 ; RMS (m/z): [M+] + calcd for C I, ; found,
7 -(4-Chlorophenyl)-2-hydroxy-2-phenylacetamide 4 Cl Colorless solid, mp = o C (Lit. 4 mp = o C); R f 0.58; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, CDCl 3 ): 8.18 (bs, 1), (m, 4), (m, 3), 7.25 (d, J = 2.4 z, 2), 5.18 (d, J = 2.8 z 1), 3.24 (d, J = 2.8 z, 1); 13 C MR (100 Mz, CDCl 3 ): 169.9, 138.9, 135.8, 129.9, 129.2, , 127.0, 121.2, 74.9; IR (KBr) 3297, 1650, 1596, 1540, 1068 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1 Cl, ; found, ydroxy--phenylpentanamide 3 C 2 C Colorless solid mp = o C; R f 0.30; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 8.38 (bs, 1), 7.57 (dd, J = 8.4, 1.2 z, 2), (m, 2), (m, 1), 4.23 (m, 1), 2.58 (d, J = 4.4 z, 1), (m, 1), (m, 1), 1.04 (t, J = 7.6 z, 3); 13 C MR (100 Mz, CDCl 3 ): 172.3, 137.2, 129.2, 124.7, 120.0, 73.6, 30.0, 9.3; IR (KBr) 3402, 3392, 1647, 1601, 1531, 1444, 1120 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, Benzyl-2-hydroxy-2-phenylacetamide 5 Colorless solid, mp = o C (Lit. 5 mp = o C); R f 0.35; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 5), (m, 3), 7.18 (dd, J = 6.8, 1.2 z, 1), 6.47 (bs, 1), 5.08 (d, J = 3.2 z, 1), (m, 2), 3.60 (d, J = 3.2 z, 1); 13 C MR (100 Mz, CDCl 3 ): 172.2, 139.5, 137.8, 129.0, 128.9, 127.7, 127.0, 74.4, 43.7; IR (KBr) 3568, 3281, 2921, 1626, 1534, 1348, 1028 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, ; found, ydroxy--methyl-, 2-diphenylacetamide C 3 Colorless solid, mp = o C; R f 0.40; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 3), (m, 3), (m, 4), 5.01 (d, J= 6.8 z, 1), 4.49 (d, J = 7.2 z, 1), 3.30 (s, 3); 13 C MR (100 Mz, CDCl 3 ): 172.9, 141.6, 139.3, 129.7, 128.4, 128.2, 128.1, 127.4, 71.7, 38.4; IR (KBr) 3423, 2952, 1655, 1596, 1585, 1496, 1020 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, ; found, tert-butyl-2-hydroxy-2-phenylacetamide ; found, Colorless solid, mp = o C; R f 0.31; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 5), 5.76 (s, 1), 4.90 (d, J = 3.6 z, 1), 3.64 (s, 1), 1.32 (s, 9); 13 C MR (100 Mz, CDCl 3 ): 171.4, 140.0, 129.0, 128.6, 127.0, 74.3, 51.6, 28.8; IR (KBr) 3225, 1645, 1538, 1409, 1452, 1065 cm 1 ; RMS (m/z): [M+a] + calcd for C a 1, 7
8 -(4-Acetylphenyl)-2-hydroxy-2-phenylacetamide C 3 Colourless solid, mp = o C R f 0.39; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, DMS-d 6 ): (bs, 1), 8.42 (d, J = 8.8 z, 2), 8.37 (d, J = 8.8 z, 2), 8.04 (d, J = 8.0 z, 2), 7.87 (t, J = 7.2 z, 2), (m, 1), 7.02 (d, J = 4.4 z, 1), 5.66 (d, J = 4.4 z, 1), 3.03 (s, 3); 13 C MR (100 Mz, DMS-d 6 ): 196.6, 171.8, 142.9, 140.6, 132.0, 129.3, 128.2, 127.8, 126.6, 119.0, 74.1, 26.5; IR (neat) 3285, 1674, 1657, 1598, 1543, 1183 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, (3-Benzoylphenyl)-2-hydroxy-2-phenylacetamide Colurless solid, mp = o C R f 0.35; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, CDCl 3 ): 8.52 (bs, 1), (m 1), 7.81 (t, J = 1.6, z, 1), 7.77 (dd, J = 7.2, 1.6 z, 2), (m 1), (m, 5), (m, 4), 5.17 (d, J = 3.6 z, 1), 3.76 (d, J = 3.6 z, 1); 13 C MR (100 Mz, CDCl 3 ): 196.5, 170.5, 138.9, 138.5, 137.5, 137.3, 132.9, 130.2, 129.2, 129.1, 129.0, 128.5, 126.9, 126.4, 123.9, 121.1, 74.8; IR (neat) 3324, 1659, 1591, 1532, 1499, 1180 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, (3-Acetylphenyl)-2-hydroxy-2-phenylacetamide C 3 Yellow colure solid, mp = o C, R f 0.38; (hexanes : ethyl acetate, 70:30 v/v): 1 MR (400 Mz, DMS-d 6 ): (bs, 1), 8.32 (t, J = 1.6 z, 1), 7.98 (dd, J = 8.2, 1.2 z, 1), 7.65 (d, J = 8.0 z, 1), 7.53 (d, J = 7.2 z, 2), 7.44 (t, J = 8.0 z, 1), 7.36 (t, J = 7.2 z, 2), (m 1), 6.48 (d, J = 4.8 z, 1), 5.13 (d, J = 4.4 z, 1), 2.54 (s, 3); 13 C MR (100 Mz, DMS-d 6 ): 197.7, 171.6, 140.8, 139.0, 137.3, 129.1, 128.2, 127.7, 126.6, 124.2, 123.4, 119.3, 74.1, 26.8; IR (neat) 3335, 1674, 1604, 1542, 1485, 1192 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, General experimental procedure for complete reduction of α-keto amides. A mixture of TMEDA (4 µl, mmol), nickel(ii)acetate (4.4 mg, mmol), K t Bu (6 mg, 0.05 mmol) in 1.5 ml of dry TF were taken in a reaction tube fitted with rubber septum under nitrogen atmosphere. The reaction mixture was stirred at room temperature for 10 min. Then the α-keto amide (0.5 mmol) was added to the reaction mixture and stirred for 10 min. then 2 Si 2 (370 µl, 2 mmol) was added slowly to the reaction mixture. After that, the rubber septum was replaced with glass stopper under nitrogen flow. The resulting reaction mixture was stirred at room temperature. The progress of the reaction was monitered by TLC. After complete disappearance of substrate, 5 ml of 2 aq. a was added to the reaction and the resulting mixture was stirred for 30 min. The reaction mixture was extracted with ethyl acetate (2x10 ml). The combined organic layers was washed with brine, dried over anhydrous MgS 4, filtered off and the solvents was removed under reduced pressure and the resulting residue was purified by neutral aluminium oxide column chromatography (eluents: hexanes-ethyl acetate, 90:10) to obtain pure -amino alcohol. 8
9 Spectral data for β-amino alchols 1-enyl-2-(phenylamino)ethanol 7 Colourless oily liqued; R f 0.36; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 4), (m, 1), 7.21 (t, J = 8.4 z, 2), 6.77 (t, J = 7.6 z, 1), 6.69 (d, J = 7.6 z, 2), 4.93 (dd, J = 8.8, 4.0 z, 1), 3.44 (dd, J = 13.2, 4.0 z, 1), 3.30 (dd, J = 13.2, 8.8 z, 1); 13 C MR (100 Mz, CDCl 3 ): 148.0, 142.1, 129.5, 128.8, 128.1, 126.0, 118.3, 113.6, 72.6, 51.9; IR (eat) 3395, 3113, 1603, 1559, 1508, 1454 cm 1 ; RMS (m/z): [M+] + calcd for C 14 16, ; found, enyl-2-(p-tolylamino)ethanol 8 Colourless oil; R f 0.39; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 5), 7.02 (d, J = 8.0 z, 2), 6.62 (t, J = 8.0 z, 2), 4.91 (dd, J = 8.6, 3.6 z, 1), 3.41 (dd, J = 13.2, 4.0 z, 1) 3.27 (dd, J = 13.2, 8.4 z, 1), 2.26 (s, 3); 13 C C 3 MR (100 Mz, CDCl 3 ): 145.6, 142.2, 130.0, 128.7, 128.0, 127.6, 126.0, 113.8, 72.5, 52.4, 20.5; IR (eat) 3451, 3444, 1646, 1547, 1407, 1258 cm 1 ; RMS (m/z): [M+] + calcd for C 15 18, ; found, (4-Methoxyphenylamino)-1-phenylethanol 9 Pale yellow oil; R f 0.34; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 4), (m, 1), 6.80 (d, J = 9.2 z, 2), 6.66 (d, J = 8.8 z, 2), 4.92 (dd, J = 8.8, 3.6 z, 1), 3.75 (s, 3), 3.38 (dd, J = 12.8, 4.0 z, 1), 3.25 C 3 (dd, J = 13.2, 8.8 z, 1); 13 C MR (100 Mz, CDCl 3 ): 152.8, 142.2, 142.1, 128.8, 128.1, 126.0, 115.2, 115.1, 72.6, 55.9, 53.1; IR (eat) 3363, 3061, 1653, 1510, 1450, 1034 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, (Methyl(phenyl)amino)-1-phenylethanol 7 Pale yellow oil; R f 0.37; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 7.33 (d, J = 7.6 z 2), 7.20 (t, J = 7.6 z, 2), 6.92 (d, J = 7.6 z, 1), 6.76 (t, J = 7.2 z, 1), 6.67 (d, J = 7.6 z, 2), 4.86 (dd, J = 8.4, 3.6 z, 1), 3.82 (s, 3), 3 C 3.38 (dd, J = 13.0, 4.0 z, 1), 3.29 (dd, J = 12.6, 8.4 z, 1); 13 C MR (100 Mz, CDCl 3 ): 159.5, 148.0, 134.3, 129.4, 127.3, 118.2, 114.1, 113.6, 72.2, 55.4, 51.8; IR (eat) 3395, 3113, 1603, 1559, 1508, 1454 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, (enylamino)butan-2-ol 10 Colourless oil; R f 0.40; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): C 7.16 (m, 2), 6.74 (tt, J = 6.0, 0.8 z, 1), 6.66 (dd, J = 8.5, 1.0 z, 2), (m, 1), 3.28 (dd, J = 13.0, 3.0 z, 1), 3.01 (dd, J = 13.0, 8.5 z, 1), (m, 2), 1.02 (t, J = 7.5 z, 3); 13 C MR (100 Mz, CDCl 3 ): 148.4, 129.4, 118.0, 113.4, 71.9, 50.0, 28.1, 10.1; IR (eat) 3281, 3054, 1677, 1605, 1503, 1461 cm 1 ; RMS (m/z): [M+] + calcd for C 10 16, ; found,
10 2-(methyl(phenyl)amino)-1-phenylethanol C3 Colourless oily liqued; R f 0.62; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): (m, 4), (m, 3), 6.89 (d, J = 8.0 z, 2), 6.82 (t, J = 7.2 z, 1), 5.01 (dd, J = 8.8, 4.4 z, 1), 3.54 (dd, J = 14.6, 8.4 z, 1), 3.46 (dd, J = 14.8, 4.4 z, 1), 2.96 (s, 3), 2.66 (bs, 1); 13 C MR (100 Mz, CDCl 3 ): 150.0, 142.1, 129.4, 128.7, 127.9, 126.0, 117.7, 113.4, 71.8, 62.1, 39.6; IR (eat) 3405, 3043, 1598, 1498, 1357, 1043 cm 1 ; RMS (m/z): [M+] + calcd for C 15 18, ; found, (4-(1-ydroxy-2-(phenylamino)ethyl)phenyl)benzamide Colourless oil; R f 0.33; (hexanes : ethyl acetate, 80:20 v/v): 1 MR (400 Mz, CDCl 3 ): 7.96 (s, 1), 7.82 (d, J = 6.8 z, 2), 7.50 (t, J = 7.2 z, 1), 7.42 (t, J = 7.6 z, 2), (m, 6), (m, 1), 6.58 (d, J = 8.8 z, 2), 4.85 (dd, J = 8.9, 3.6 z, 1), 3.35 (dd, J = 13.2, 4.8 z, 1), 3.23 (dd, J = 13.2, 8.8 z, 1); 13 C MR (100 Mz, CDCl 3 ): 166.0, 145.4, 142.3, 135.1, 131.7, 128.8, 128.7, 128.6, 128.0, 127.2, 126.0, 122.9, 113.8, 72.3, 52.1; IR (eat) 3385, 3060, 1643, 1523, 1474, 1407, 1061 cm 1 ; RMS (m/z): [M+a] + calcd for C , ; found, (1-ydroxy-2-(phenylamino)ethyl)--phenylbenzamide Pale yellow oil; R f 0.40; (hexanes : ethyl acetate, 60:40 v/v): 1 MR (400 Mz, DMS-d 6 ): 9.76 (s, 1), 7.77 (t, J = 8.8 z, 4), 7.42 (d, J = 7.6 z, 2), (m, 5), 7.04 (t, J = 7.6 z, 1), 6.69 (d, J = 8.0 z, 2), 4.77 (t, J = 6.8 z, 1), 3.31 (dd, J = 13.2, 4.4 z, 2), 3.22 (dd, J = 13.0, 8.0 z, 1); 13 C MR (100 Mz, DMS-d 6 ): 165.3, 151.6, 144.0, 139.8, 129.3, 128.5, 128.1, 127.1, 126.1, 122.9, 121.2, 120.2, 111.0, 70.8, 50.9; IR (eat) 3548, 3412, 3344, 1645, 1603, 1516, 1063 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, Benzyl-4-(1-hydroxy-2-(phenylamino)ethyl)benzamide Colourless oil; R f 0.32; (hexanes : ethyl acetate, 60:40 v/v): 1 MR (400 Mz, DMS-d 6 ): 8.62 (t, J = 6.0z, 1), 7.68 (d, J = 8.4 z, 2), 7.41 (d, J = 7.2 z, 2), (m, 8), 6.65 (d, J = 8.4 z, 6), 4.74 (dd, J = 7.8, 4.8 z, 1), 4.43 (d, J = 6.0 z, 1), 3.27 (dd, J = 13.0, 4.4 z, 1), 3.18 (dd, J = 13.0, 8.0 z, 1); 13 C MR (100 Mz, DMS-d 6 ): 166.2, 151.1, 144.0, 140.4, 128.8, 128.2, 128.1, 127.2, 127.1, 126.6, 126.1, 121.2, 111.2, 70.8, 51.0, 42.4; IR (eat) 3361, 3062, 3032, 1728, 1608, 1512, 1059 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, Benzyl-4-(1-hydroxy-2-(phenylamino)ethyl)--methylbenzamide Me Yellow oil; R f 0.35; (hexanes : ethyl acetate, 60:40 v/v): 1 MR (400 Mz, DMS-d 6 ): δ (m, 7), (m, 5), 6.64 (d, J = 8.4 z, 2), 4.74 (dd, J = 7.8, 4.8 z, 1), 4.60 (s, 2), 3.25 (dd, J = 13.2, 4.4 z, 1)
11 (dd, J = 13.2, 8.0 z, 1), 2.87 (s, 3); 13 C MR (100 Mz, DMS-d 6 ): 170.9, 149.6, 143.5, 137.4, 128.3, 128.1, 127.6, 126.8, 126.6, 126.5, 125.7, 122.8, 111.1, 70.7, 51.9, 50.8, 35.0; IR (eat) 3489, 3402, 1610, 1529, 1491, 1070 cm 1 ; RMS (m/z): [M+] + calcd for C , ; found, (3-Chloro-4-(1-hydroxy-2-(phenylamino)ethyl)phenyl)--methylbenzamide C 3 Cl Colourless oil; R f 0.43; (hexanes : ethyl acetate, 60:40 v/v): 1 MR (400 Mz, DMS-d 6 ): 7.47 (d, J = 7.6 z, 2), 7.38 (d, J = 7.6 z, 2), 7.33 (t, J = 6.8 z, 3), 7.15 (t, J = 7.6 z, 4), 7.00 (d, J = 8.4 z 1), 6.55 (d, J = 8.4 z 1), 5.64 (d, J = 4.4 z, 1), 5.44 (t, J = 5.2 z, 1), (m, 1), 3.45 (s, 3), (m, 1); 13 C MR (100 Mz, CDCl 3 ): 168.1, 145.3, 145.0, 143.5, 136.0, 134.8, 134.0, 129.2, 128.1, 127.5, 126.9, 126.0, 123.4, 116.4, 110.0, 70.5, 50.4, 38.3; IR (eat) 3404, 3064, 1600, 1526, 1495, 1459, 1060 cm 1 ; RMS (m/z): [M+] + calcd for C Cl, ; found, References: [1] R.. Baker, L. E. Linn, J. Am. Chem. Soc. 1948, 70, [2] A. R. Katritzky,.-Y. e, K. Suzuki, J. rg. Chem. 2000, 65, [3]. Kambe, T. Inoue, T. Takeda, S.-i. Fujiwara,. Sonoda, J. Am. Chem. Soc. 2006, 128, [4] S. L. Shapiro, I. M. Rose, L. Freedman, J. Am. Chem. Soc. 1959, 81, [5] A. Westerbeek, W. Szymanski, B. L. Feringa, D. B. Janssen, ACS Catal. 2011, 1, [6] S. Sebti, Tetrahedron, 1986, 42, [7] A. Mukherjee, R. B. Dateer, R. Chaudhuri, S. Bhunia, S.. Karad, R.-S. Liu, J. Am. Chem. Soc. 2011, 133, [8] Shivani, B. Pujala, A. K. Chakraborti, J. rg. Chem. 2007, 72, [9] Y. Gu, J. Barrault, F. Jerome, Adv. Synth. Catal. 2008, 350, [10] R. I. Kureshy, S. Agrawal, M. Kumar,.. Khan, S.. R. Abdi,. C. Bajaj, Catal. Lett. 2010, 134,
12 C Mz 1 -MR spectra of 4a in CDCl Mz 13 C-MR spectra of 4a in CDCl 3 12
13 400 Mz 1 -MR spectra of 4b in CDCl Mz 13 C-MR spectra of 4b in CDCl 3 13
14 C Mz 1 -MR spectra of 4c in CDCl Mz 13 C-MR spectra of 4c in CDCl 3 14
15 400 Mz 1 -MR spectra of 6a in DMS-d Mz 13 C-MR spectra of 6a in DMS-d 6 15
16 400 Mz 1 -MR spectra of 6b in DMS-d Mz 13 C-MR spectra of 6b in DMS-d 6 16
17 C Mz 1 -MR spectra of 6c in DMS-d Mz 13 C-MR spectra of 6c in DMS-d 6 17
18 C 3 Cl 400 Mz 1 -MR spectra of 6d in DMS-d Mz 13 C-MR spectra of 6d in DMS-d 6 18
19 400 Mz 1 -MR spectra of 6e in CDCl 3 +DMS-d Mz 13 C-MR spectra of 6e in CDCl 3 +DMS-d 6 19
20 400 Mz 1 -MR spectra of 2a in CDCl Mz 13 C-MR spectra of 2a in CDCl 3 20
21 400 Mz 1 -MR spectra of 2b in CDCl Mz 13 C-MR spectra of 2b in CDCl 3 21
22 3 C 400 Mz 1 -MR spectra of 2c in CDCl Mz 13 C-MR spectra of 2c in CDCl 3 22
23 C Mz 1 -MR spectra of 2d in CDCl Mz 13 C-MR spectra of 2d in CDCl 3 23
24 C Mz 1 -MR spectra of 2e in CDCl Mz 13 C-MR spectra of 2e in CDCl 3 24
25 I 400 Mz 1 -MR spectra of 2f in CDCl Mz 13 C-MR spectra of 2f in CDCl 3 25
26 C 400 Mz 1 -MR spectra of 2g in CDCl Mz 13 C-MR spectra of 2g in CDCl 3 26
27 400 Mz 1 -MR spectra of 2h in CDCl Mz 13 C-MR spectra of 2h in CDCl 3 27
28 400 Mz 1 -MR spectra of 2i in CDCl Mz 13 C-MR spectra of 2i in CDCl 3 \ 28
29 Cl 400 Mz 1 -MR spectra of 2j in CDCl Mz 13 C-MR spectra of 2j in CDCl 3 29
30 400 Mz 1 -MR spectra of 2k in CDCl Mz 13 C-MR spectra of 2k in CDCl 3 30
31 C Mz 1 -MR spectra of 2l in CDCl Mz 13 C-MR spectra of 2l in CDCl 3 31
32 400 Mz 1 -MR spectra of 5a in CDCl Mz 13 C-MR spectra of 5a in CDCl 3 32
33 400 Mz 1 -MR spectra of 5b in CDCl Mz 13 C-MR spectra of 5b in CDCl 3 33
34 C Mz 1 -MR spectra of 5c in CDCl Mz 13 C-MR spectra of 5c in CDCl 3 34
35 400 Mz 1 -MR spectra of 3a in CDCl Mz 13 C-MR spectra of 3a in CDCl 3 35
36 3 C 2 C 400 Mz 1 -MR spectra of 3b in CDCl Mz 13 C-MR spectra of 3b in CDCl 3 36
37 3 C 400 Mz 1 -MR spectra of 3c in CDCl Mz 13 C-MR spectra of 3c in CDCl 3 37
38 C Mz 1 -MR spectra of 3d in CDCl Mz 13 C-MR spectra of 3d in CDCl 3 38
39 C Mz 1 -MR spectra of 3e in CDCl Mz 13 C-MR spectra of 3e in CDCl 3 39
40 C3 400 Mz 1 -MR spectra of 3l in CDCl Mz 13 C-MR spectra of 3l in CDCl 3 40
41 400 Mz 1 -MR spectra of 7a in DMS-d Mz 1 -MR spectra of 7a in DMS-d 6 41
42 400 Mz 1 -MR spectra of 7b in DMS-d Mz 13 C-MR spectra of 7b in DMS-d 6 42
43 3 C 400 Mz 1 -MR spectra of 7c in DMS-d Mz 13 C-MR spectra of 7c in DMS-d 6 43
44 3 C Cl 400 Mz 1 -MR spectra of 7d in DMS-d Mz 13 C-MR spectra of 7d in DMS-d 6 44
45 400 Mz 1 -MR spectra of 7e in CDCl Mz 13 C-MR spectra of 7e in CDCl 3 45
46 46
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