First Total Synthesis of Antimitotic Compound, (+)-Phomopsidin
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1 First Total Synthesis of Antimitotic Compound, (+)-Phomopsidin Takahiro Suzuki, a Kenji Usui, a Yoshiharu Miyake, a Michio Namikoshi, b and Masahisa Nakada a, * a Department of Chemistry, School of Science and Engineering, Waseda University hkubo, Shinjuku-ku, Tokyo , Japan b Department of cean Sciences, Tokyo University of Marine Science and Technology Minato-ku, Tokyo , Japan General Information. 1 and 13 C NMR spectra were recorded on a JEL AL-400 spectrometer. 1 and 13 C chemical shifts are reported in ppm downfield from tetramethylsilane (TMS, δ scale) with the solvent resonances as internal standards. The following abbreviations were used to explain the multiplicities: s, singlet; d, doublet; t, triplet; q, quartet; m, multiplet; band, several overlapping signals; b, broad. IR spectra were recorded on a JASC FT/IR Melting points (mp) are uncorrected, recorded on a Yamato capillary melting point apparatus. ptical rotations were measured using a 2 ml cell with a 1 dm path length on a JASC DIP Mass spectra and elemental analyses were provided at the Materials Characterization Central Laboratory, Waseda University. All reactions were carried out under an argon atmosphere with dry, freshly distilled solvents under anhydrous conditions, unless otherwise noted. All reactions were monitored by thin-layer chromatography carried out on 0.25 mm E. Merck silica gel plates (60F-254) using UV light as visualizing agent and phosphomolybdic acid and heat as developing agents. E. Merck silica gel (60, particle size mm) was used for flash column chromatography. Preparative thin-layer chromatography (PTLC) separations were carried out on self-made 0.3 mm E. Merck silica gel plates (60F-254). Materials. TF was distilled from sodium/benzophenone ketyl, and methylene chloride (C2Cl2), benzene, and toluene from calcium hydride. Toluene was distilled from sodium. DMF was distilled from Ca2 under reduced pressure. (-)-(5S)-5-Methyl-tetrahydro-pyran-2-one (6). 6 Rf =0.49 (hexane/ethyl acetate=2/1); 1 NMR (400 Mz, CDCl 3 ) δ 4.24 (1, ddd, J=11.0, 4.4, 2.0 z), 3.84 (1, dd, J=11.0, 11.0 z), 2.57 (1, ddd, J=17.7, 6.8, 4.2 z), 2.44 ( 1, ddd, J=17.7, 10.0, 7.3 z), (2, m), 1.47 (1, ddd, J=13.3, 10.0, 6.8 z), 0.94 (3, d, J=6.6 z); 13 C NMR (100 Mz, CDCl 3 ) δ 171.0, 74.9, 29.1, 27.9, 27.5, 16.6; IR (neat) ν max 3452, 2968, 1734, 1508, 1464, 1398, 1346, 1254, 1214, 1182, 1096, 1050, 908, 888 cm -1 ; FAB-MS [M+] + calculated for C6112 : , found : ; [α] 19 D (c 0.3, CCl 3 ). Â1
2 (-)-(6S)-7-(1-Ethoxy-ethoxy)-6-methyl-1-trimethylsilanyl-hept-1-yn-3-one (8). EE TMS 8 Rf =0.54 (hexane/ethyl acetate=4/1); 1 NMR (400 Mz, CDCl 3 ) δ (2/2, m), (2/2, m), (4/2, m), (2/2, m), (2, m), (2, m), (1, m), 1.26 (3, d, J=5.4 z), 1.16 (3, t, J=7.1z), 0.89 (3, d, J= 6.6z); 13 C NMR (100 Mz, CDCl 3 ) δ 188.4, 100.3, 100.2, 70.8, 70.7, 61.4, 43.7, 33.7, 28.4, 20.5, 17.7, 16.1, 0.0; IR (neat) ν max 2968, 1680, 1382, 1254, 1136, 1086, 1062, 848 cm -1 ; FAB-MS [M+] + calculated for C15293Si : , found : ; [α] 29 D -2.5 (c 0.5, CCl 3 ). (-)-(3S,6S)-7-(1-Ethoxy-ethoxy)-6-methyl-3-triisopropylsilanyloxy-hept-1-yne (10). EE TIPS 10 Rf =0.66 (hexane/ethyl acetate=4/1); 1 NMR (400 Mz, CDCl 3 ) δ 4.67 (1, q, J=5.4 z), 4.46 (1, dt, J=6.0, 2.0 z), (2/2, m), (3/2, m), 3.36 (1/2, dd, J=9.0, 6.6z), 3.29 (1/2, dd, J=9.3, 5.9 z), 3.20 (1/2, dd, J=9.0, 6.6 z), 2.37 (1, d, J=2.2 z), (5, m), 1.30 (3, d, J=5.4 z), 1.20 (3, t, J=7.1 z), (21, m), 0.94 (3, d, J=6.8 z); 13 C NMR (100 Mz, CDCl 3 ) δ 99.6, 85.6, 72.0, 70.5, 63.1, 60.7, 36.3, 33.4, 28.8, 19.9, 19.8, 18.1, 17.3, 15.4, 12.3; IR (neat) ν max 2948, 2872, 1464, 1382, 1340, 1136, 1098, 1062, 882 cm -1 ; FAB-MS [M-] + calculated for C21413Si : , found : ; [α] 20 D -5.2 (c 0.9, CCl 3 ). (+)-(2Z,4E)-(6S,9S)-10-(1-Ethoxy-ethoxy)-3,9-dimethyl-6-triisopropylsilanyloxy-deca-2,4-dien-1-ol (11). EE TIPS 11 Rf =0.30 (hexane/ethyl acetate=4/1); 1 NMR (400 Mz, CDCl 3 ) δ 6.51 (1, d, J=15.6 z), 5.74 (1, dd, J=15.6, 6.4 z), 5.54 (1, t, J=6.9 z), 4.66 (1, q, J=5.4 z), (3, m), (2/2, m), (3/2, m), 3.33 (1/2, dd, J=9.3, 6.8 z), 3.27 (1/2, dd, J=9.3, 5.7 z), 3.17 (1/2, dd, J=9.3, 6.8 z), 1.85 (3, s), (5, m), 1.29 (3, d, J=5.4 z), 1.19 (3, t, J=7.1 z), (21, m), 0.91 (3, d, J=6.6 z); 13 C NMR (100 Mz, CDCl 3 ) δ 135.3, 134.8, 127.7, 125.2, 99.6, 99.6, 73.9, 70.6, 60.7, 60.7, 58.5, 36.1, 33.7, 33.7, 28.7, 28.7, 20.6, 19.9, 19.8, 18.3, 18.2, 18.1, 17.3, 15.4, 15.3, 12.5; IR (neat) ν max 3448, 2944, 2872, 1464, 1382, 1342, 1136, 1086, 1060, 1014, 966, 884 cm -1 ; FAB-MS [M+] + calculated for C25504Si : , found : ; [α] 19 D +2.7 (c 0.9, CCl 3 ). Â2
3 (-)-(3E,9E,11Z)-(5S,8S)-5,11-Dimethyl-8-triisopropylsilanyloxy-oxacyclotrideca-3,9,11-trien-2-one (4). TIPS 4 Rf =0.34 (hexane/ethyl acetate=10/1); 1 NMR (400 Mz, CDCl 3 ) δ 7.06 (1, dd, J=15.9, 7.1 z), 6.29 (1, d, J=16.1 z), (3, m), 5.04 (1, ddd, J=13.9, 4.6, 1.5 z), 4.47 (1, dd, J=13.9, 6.1), 4.24 (1, dd, J=10.3, 4.6), 1.86 (3, s), (5, m), (24, m); 13 C NMR (100 Mz, CDCl 3 ) δ 167.2, 157.3, 137.9, 133.5, 129.7, 122.7, 119.8, 71.3, 60.5, 35.5, 33.0, 31.6, 20.4, 18.1, 17.3, 12.3; IR (neat) ν max 2944, 2868, 1724, 1460, 1368, 1244, 1162, 1084, 1062, 994, 882 cm -1 ; FAB-MS [M+] + calculated for C23413Si : , found : ; [α] 19 D -6.4 (c 0.08, CCl 3 ). 4,9-Dimethyl-6-triisopropylsilanyloxy-3a,5a,6,7,8,9,9a,9b-octahydro-3-naphtho-[1,2-c]furan-1-one (3). TIPS 3 Rf =0.33 (hexane/ethyl acetate=4/1); 1 NMR (400 Mz, CDCl 3 ) δ 5.81 (major-1, s), 5.50 (minor-1, s), (major-2, minor-2, m), (minor-1, m), 3.79 (major-1, ddd, J=11.7, 9.5, 4.4 z), (major-1, minor-1, m), (major-1, m), (minor-2, m), (major-1, m), (minor-3, m), (major-6, minor-4, m), (major-3, minor-2, m), (major-21, minor-21, m), (major-3, minor-3, m) 13 C NMR (100 Mz, CDCl 3 ) δ 180.0, 178.8, 132.1, 130.3, 128.0, 125.2, 72.3, 71.9, 70.3, 70.3, 42.3, 41.8, 40.2, 39.9, 39.7, 38.8, 38.4, 33.5, 33.2, 32.3, 31.5, 28.8, 26.8, 26.6, 21.2, 21.1, 19.3, 18.2, 18.1, 17.1, (+)-4-Bromo-benzoic acid (3aS,5aS,6S,9S,9aR,9bS)-4,9-dimethyl-1-oxo-1,3,3a,5a,6,7,8,9,9a,9b-decahydronaphtho[1,2-c]furan-6-yl ester (12). p-brbz 12 Rf =0.49 (hexane/ethyl acetate=2/1); mp=78-80µ; 1 NMR (400 Mz, CDCl 3 ) δ 7.88 (2, d, J=8.5 z), 7.58 (2, d, J=8.5 z), 5.77 (1, s), 5.08 (1, ddd, J=11.8, 4.6, 4.6 z), (2, m), 3.05 (1, dd, J= 7.8, 2.9 z), 2.87 (1, s), 2.76 (1, s), (2, m), (4, m), (2, m), (1,m), 0.98 (3, d, J=6.6 z); 13 C NMR (100 Mz, CDCl 3 ) δ 178.3, 164.7, 132.2, 131.6, 131.0, 129.5, 127.9, 124.0, 74.9, 70.2, 41.5, 39.5, 38.3, 35.8, 32.6, 28.8, 27.3, 21.2, 19.2; IR (KBr) ν max 2932, 1768, 1714, 1592, 1486, 1398, 1378, 1270, 1214, 1174, 1150, 1102, 1070, 1034, 1012, 982, 848, 758 cm -1 ; FAB-MS [M+] + calculated for C2124Br4 : , found : Â3
4 ; [α] 22 D (c 0.1, CCl 3 ). (+)-(1S,4S,4aS,5S,6R,8aS)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-6-ethynyl-4,7-dimethyl-1-triisopropylsilanyloxy-1,2,3,4,4a,5,6,8a-octahydro-naphthalene (2). BPS TIPS 2 Rf =0.41 (hexane/ethyl acetate=40/1); 1 NMR (400 Mz, CDCl 3 ) δ (4, m), (6, m), 5.70 (1, s), 4.13 (1, dd, J=10.5, 5.4 z), 3.87 (1, ddd, J=11.2, 4.6, 4.6 z), 3.70 (1, dd, J= 10.5, 10.5 z), (1, m), (1, m), (1, m), 1.90 (1, d, J=2.7 z), (1, m), (3, m), (2, m), (30, m), 0.88 (3, d, J=6.6 z); 13 C NMR (100 Mz, CDCl 3 ) δ 135.4, 134.1, 130.1, 129.4, 127.5, 122.5, 83.4, 73.3, 71.3, 62.1, 39.8, 38.5, 37.7, 31.8, 31.5, 28.4, 26.9, 22.4, 22.2, 19.5, 19.1, 18.3, 12.5; IR (neat) ν max 3312, 3076, 2936, 2868, 1464, 1428, 1382, 1246, 1218, 1112, 1092, 1046, 1014, 1000, 882, 816, 762, 740, 702 cm -1 ; FAB-MS [M-] + calculated for C40592Si2 : , found : ; [α] 22 D (c 0.1, CCl 3 ). (-)-Benzoic acid (1S,4S,4aS,5S,6R,8aS)-5-hydroxymethyl-4,7-dimethyl-6-((E)-1-methyl-propenyl)-1,2,3,4,4a,5,6, 8a-octahydro-naphthalen-1-yl ester (20). Bz 20 Rf =0.24 (hexane/ethyl acetate=4/1); mp=47-48µ; 1 NMR (400 Mz, CDCl 3 ) δ (2, m), (3, m), 5.69 (1, s), 5.25 (1, q, J=5.1 z), 5.03 (1, ddd, J=11.7, 4.6, 4.6 z), 3.62 (1, dd, J=11.0, 6.6 z), 3.42 (1, dd, J=11.0, 7.1 z), (2, m), (1, m), (1, m), (12, m), (1, m), (1, m), 0.95 (3, d, J=6.6 z); 13 C NMR (100 Mz, CDCl 3 ) δ 165.8, 135.6, 135.4, 132.7, 130.7, 129.5, 128.2, 122.6, 122.2, 75.7, 63.6, 48.2, 47.9, 39.0, 35.0, 32.8, 28.2, 27.4, 22.1, 19.0, 17.0, 13.7; IR (KBr) ν max 3488, 2932, 1722, 1452, 1380, 1276, 1176, 1116, 1070, 1026, 982, 712 cm -1 ; FAB-MS [M+] + calculated for C24333 : , found : ; [α] 22 D (c 0.1, CCl 3 ). (+)-phomopsidin (synthetic) C 2 Â4
5 Rf =0.20 (hexane/ethyl acetate=1/1); mp=66µ; 1 NMR (600 Mz, CD 3 D) δ 7.18 (1, dd, J=15.4, 10.8 z), (1, m), 6.15 (1, d, J=15.1, 10.8 z), 5.77 (1, d, J=15.4 z), 5.73 (1, s), 5.22 (1, q, J=6.7 z), 3.57 (1, ddd, J=11.3, 4.6, 4.6 z), (2, m), (1, m), (2, m), 1.60 (3, s), 1.55 (3, d, J=6.7 z), 1.48 (3, s), (3, m), (1, m), 0.94 (3, d, J=6.7 z); 13 C NMR (120 Mz, CDCl 3 ) δ 170.8, 148.8, 146.9, 136.4, 136.0, 129.0, 124.3, 123.5, 120.5, 73.3, 51.3, 45.3, 39.1, 34.1, 31.1, 29.9, 22.3, 19.4, 16.8, 13.5; [α] 19 D (c 0.1, C 3 ). Â5
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