New Glucuronic Acid Donors for the Modular Synthesis of Heparan Sulfate Oligosaccharides

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1 Electronic Supplementary Material (ESI) for Organic & Biomolecular Chemistry. This journal is The Royal Society of Chemistry 214 Supporting Information New Glucuronic Acid Donors for the Modular Synthesis of Heparan Sulfate Oligosaccharides Omkar P. Dhamale, Chengli Zong, Kanar Al-Mafraji and Geert-Jan Boons* Complex Carbohydrate Research Center, The University of Georgia, 315 Riverbend Road, Athens, GA Fax: Table of contents: Preparations and characterizations of compounds 37, 38, S1-S6 Copies of 1 H and HSQC NMR spectra

2 Methyl (Phenyl 2-O-levulinoyl-3-O-benzyl-4-O-(9-fluorenylmethoxycarbonyl)-1-thio-α-Lidopyranoside)uronate (37). Compound 37 was prepared according to a literature procedure (S. U. Hansen, G. J. Miller, G. C. Jayson and J. M. Gardiner, Org. Lett., 213, 15, 88-91). 1 H NMR (3 MHz, CDCl 3 ) δ (m, 18H, CH Aromatic), 5.64 (s, 1H, H-1), 5.42 (d, J = 2.1 Hz, 1H, H-5), (m, 2H, H-2, H-5), 4.85 (d, J = 11.7 Hz, 1H, CHHBn), (d, J = 11.7 Hz, 1H, CHHBn), 1 (dd, J = 1.3, 7.3 Hz, 1H, CHHNap ), 4.36 (dd, J =, 7.3 Hz, 1H, CHHNap), 4.22 (t, J = 7.2 Hz, 1H, CHNap), 3.95 (t, J = 2.9 Hz, 1H, H-3), 3.79 (s, 3H,COOCH 3 ), (m, 4H, CH 2 Lev), 2.3 (s, 3H, CH 3 Lev). 13 C NMR (75 MHz, CDCl 3 ) δ 13.7, 127.7, 12, 124.7, 119.8, 85.8, 73.7, 71.6, 69.3, 69.6, 67.7, 6, 49., 46.7, 29.9, HRMS: m/z: calcd for C 4 H 38 O 1 SNa: ; found: [M+Na] +. N-(Benzyl)-benzyloxycarbonyl-5-aminopentyl-O-(methyl-2-O-levulinoyl-3-O-benzyl-α-Lidopyranosyluronate)-(1 4)-O-2-azido-3-O-benzyl-6-O-levulinoyl-α-D-glycopyranoside (38). A suspension of compounds 37 (1 g, 2.13 mmol), 3 (1.1 g, 1.42 mmol) and activated molecular sieves (4Å crushed, 15 mg) in dichloromethane (2 ml) was stirred at ambient temperature under an atmosphere of Ar for 1 h. The mixture was cooled to o C followed by addition of NIS (.35 mg, 6 mmol) and AgOTf (.18 g,.71 mmol). TLC analysis (hexane/etoac, 1/1, v/v) showed complete consumption of the donor. Et 3 N (4 ml) was added and stirred for another 1 h followed by filtration through a pad of Celite and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography using a gradient of hexane /EtOAc (2/1 1/1, v/v) to give compound 38 as oil (1.7 g, 7%). (NMR data reported in: S. Arungundram, K. Al-Mafraji, J. Asong, F. E. Leach, III, I. J. Amster, A. Venot, J. E. Turnbull and G. J. Boons, J. Am. Chem. Soc., 29, 131, ). S2

3 Ph O O BnO O OH OTDS a HO BnO BnO S1 O OH OTDS b MeOOC BnO BnO O OH S2 OTDS c MeOOC BnO BnO O OR 1 OR 2 d MeOOC BnO BnO O OR OTCAI S3, R2 =H, R 1 = Ac S4, R2 = TDS, R 1 = Lev S5, R2= TDS, R 3 = PivOAc 21, R = Ac 23, R = Lev 25, R = PivOAc Scheme S1. Synthesis of glucuronic acid donors with C-4 benzyl ether. Reagents and conditions: a) Et 3 SiH,, PhBCl 3, 3Å Molecular sieves, DCM, -78 C (91%); b) (i) TEMPO, BAIB, rt, DCM, H 2 O; (ii) CH 2 N 2, Et 2 O, (84%); c) (i) Ac 2 O, pyridine and then HF:Pyr. THF (79%, S3); (ii) levulinic acid, DCC, DMAP, rt, DCM, (89%, S4); (iii) PivOAc-Cl, DMAP, Pyr., (88%, S5); d) (i) HF:Pyr. THF; (ii) Cl 3 CCN, NaH, DCM. Dimethylthexylsilyl 3,4-O-benzyl-β-D-glucopyranoside (S1). A solution of compound 1 (1. g, 2. mmol) and activated molecular sieves (3Å, 1. g) in dichloromethane (2 ml) was stirred at ambient temperature under an atmosphere of Ar for 1 h. The mixture was cooled to -78 o C followed by addition of Et 3 SiH (576 µl, 6. mmol) and PhBCl 2 ( ml, 7. mmol). After being stirred for 1 h at -78 o C, Et 3 N (3 ml) and MeOH (3 ml) were added successively, and the mixture was diluted with CHCl 3 (2 ml) and washed with NaHCO 3 (sat.), dried (MgSO 4 ), filtered and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography using a gradient of CHCl 3 /MeOH (95/5 8/2, v/v) to give compound S1 as oil (.91 g, 91%). 1 H NMR (5 MHz, CDCl 3 ) δ (m, 1H, CH Aromatic), 4.98 (d, J = 11.2 Hz, 1H, CHHBn), 4.89 (dd, J = 18.4, 11.1 Hz, 2H, CHHBn, CHHBn), 4.67 (d, J = 11. Hz, 1H, CHHBn), 8 (d, J = Hz, 1H, H-1), 3.86 (dd, J = 11.9, 2.9 Hz, 1H, H-6a), (m, 3H, H6b, H-4, H-3), (m, 2H, H-2, H-5), (m, 1H, CH(CH 3 ) 2 ), (m, 12H, C(CH 3 ) 2 and CH(CH 3 ) 2 ),.21 (s, 6H, Si(CH 3 ) 2 ). 13 C NMR (126 MHz, CDCl 3 ) δ 128., 97.7, 84.2, 76.8, 76.7, 7, 75.2, 75.1, 75., 62.3, 34.3, 1, HRMS: m/z: calcd for C 28 H 42 O 6 SiNa: ; found: [M+Na] +. S3

4 Dimethylthexylsilyl O-methyl-3,4-O-benzyl-β-D-glucopyranosyluronate (S2). Compound S2 (355 mg, 84%) was prepared according to the general procedure from compound S1 (4 mg,.8 mmol) using TEMPO (3 mg,.2 mmol), BAIB (64 mg, 1.99 mmol) and freshly prepared solution of diazomethane in Et 2 O (2 ml). 1 H NMR (6 MHz, CDCl 3 ) δ (m, 6H, CH Aromatic), (m, 5H, CH Aromatic), 4.92 (d, J = 11.3 Hz, 1H, CHHBn), (m, 2H, CHHBn, CHHBn), 4.62 (d, J = 11.3 Hz, 1H, CHHBn), 3 (d, J = 7.4 Hz, 1H, H-1), (m, 1H, H-5), 3.84 (d, J = 8.9 Hz, 1H, H-4), (m, 3H, COOCH 3 ), 3.59 (t, J = 9. Hz, 1H, H-3), (m, 1H, H-2), 5 (d, J = 2.8 Hz, 1H, CH(CH 3 ) 2 ), (m, 12H, C(CH 3 ) 2 and CH(CH 3 ) 2 ),.15 (s, 3H, SiCH 3 ),.17 (s, 3H, SiCH 3 ), 13 C NMR (151 MHz, CDCl 3 ) δ 126.7, 126.1, 125.6, 98., 82.7, 78.1, 76.93, 74.3, 74.2, 73.4, 56.4, 51.8, 33.1, 29.1, 2.8, 19.6, -.3. HRMS: m/z: calcd for C 29 H 42 O 7 SiNa: ; found: [M+Na] +. Methyl-2-O-acetyl-3,4-O-benzyl-α/β-D-glucupyranosyluronate (S3). A solution of compound S2 (9 mg,.17 mmol) in a mixture of pyridine and acetic anhydride (4/1, v/v,.2 M) was stirred for 2 hr at ambient temperature. The mixture was co-evaporated with toluene in vacuo and dried on the membrane pump for 3 hours. To a stirred solution of the resulting crude material in THF (2 ml), 3% HF in pyridine (34 µl) was added. After stirring at ambient temperature for 18 h, TLC analysis (hexanes/etoac, 6/4, v/v) indicated complete consumption of the starting material. The reaction mixture was subsequently diluted with DCM (1 ml), washed with water, NaHCO 3 (sat.), and brine. The organic phase was dried (MgSO 4 ), filtered, and the filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography using a gradient of hexanes/etoac (2/1 1/1, v/v) to give compound S3 as oil (57 mg, 79%). 1 H NMR (5 MHz, CDCl 3 ) δ (m, 1H, CH Aromatic), (d, J = 3.6 Hz, 1H, H-1), (m, 5H, H-2, 3 CHHBn), 4.66 (d, J = 1.9 Hz, 1H, CHHBn,), 3 (d, J = 9.3 Hz, 1H, H-5), 4.9 (t, J = Hz, 1H, H-3), 3.88 (t, J = 8. Hz, 1H, H-4), 3.76 (s, 3H, COOCH 3 ), (d, J = 9.4 Hz, 3H, COCH 3 ). 13 C NMR (126 MHz, CDCl 3 ) δ 129.8, 128.4, 128.3, 127.7, 9.8, 79.2, 78.7, 75.4, 75., 7, 72.9, 7.6, 51.9, 2. HRMS: m/z: calcd for C 23 H 26 O 8 Na: ; found: [M+Na] +. S4

5 Dimethylthexylsilyl O-methyl-2-O-levulinoyl-3,4-O-benzyl-β-D-glucupyranosyluronate (S4). A suspension of DCC (117 mg,.57 mmol) and DMAP (1 mg,.1 mmol) was added to a solution of compound S2 (1 mg,.19 mmol) and levulinilic acid (39 µl,.38 mmol) in DCM (1 ml) at C. After stirring for 6 h at ambient temperature, TLC analysis (hexanes/etoac, 7/3, v/v) indicated the consumption of the starting material. The mixture was filtered over pad of Celite and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography using a gradient of hexanes/etoac (3/1 1/1, v/v) to give compound S4 as oil (15 mg, 89%). 1 H NMR (5 MHz, CDCl 3 ) δ (m, 11H, CH Aromatic), 4.99 (t, J = 9.3, 7.2 Hz, 1H, H-2), 4.79 (dd, J = 1, 5.2 Hz, 2H, CHHBn, CHHBn), (m, 3H, H-1, CH 2 Bn), (m, 2H, H-4, H-5), 3.75 (s, 3H, COOCH 3 ), 3.68 (t, J = 8.4 Hz, 1H, H-3), 2.68 (dt, J = 1, 6.8 Hz, 2H, CH 2 Lev), 2.49 (t, J = 6.8 Hz, 2H, CH 2 Lev), 2.17 (s, 3H, CH 3 Lev), 1.31 (s, 1H, CH(CH 3 ) 2 ), (m, 12H, C(CH 3 ) 2 and CH(CH 3 ) 2 ),.17 (s, 3H, SiCH 3 ),.13 (s, 3H, SiCH 3 ). 13 C NMR (151 MHz, CDCl 3 ) δ 128.2, 127.9, 127.8, 127.7, 96.1, 82., 79., 74.9, 74.8, 7, 37.7, 3., 29.4, 27.8, 19., 1.3. HRMS: m/z: calcd for C 34 H 48 O 9 SiNa: ; found: [M+Na] +. Dimethylthexylsilyl O-methyl-2-O-(4-acetoxy-2,2-dimethylbunoate)-3,4-O-benzyl-β-Dglucupyranosyluronate (S5). To a stirring solution of compound S2 (1 mg,.19 mmol) in pyridine (1 ml), DMAP (3 mg,.19 mmol) and 4-acetoxy-2,2-dimethyl butanoyl chloride (45 µl,.38 mmol) was added at o C. After stirring for 4hr at ambient temperature, TLC analysis (hexanes/etoac, 7/3, v/v) indicated the total consumption of the starting material, after which the reaction mixture was diluted with EtOAc (1 ml) and washed with aqueous NaHCO 3 (1%), H 2 O, brine, dried (MgSO 4 ), filtered and the filtrate was concentrated under reduced pressure. The mixture was concentrated under reduced pressure and was purified by silica gel column chromatography using a gradient of hexanes/etoac (4/1 1/1, v/v) to compound S5 as oil (114 mg, 88%). 1 H NMR (6 MHz, CDCl 3 ) δ (m, 1H, CH Aromatic), (m, 1H, H-2), (m, 5H, 4 CHHBn, H-1), (t, 2H, CH 2 PivOAc), (m, 4H, COOCH 3, H-4), (t, J = Hz, 1H, H-3), (m, 3H, CH 3 PivOAc), 1.85 (t, J = 7.7, 2H, CH 2 PivOAc), 1.61 (m, 1H, CH(CH 3 ) 2 ), 1.18 (d, J = 4.7 Hz, 6H, 2xCH 3 PivOAc), (m, 12H, C(CH 3 ) 2 and CH(CH 3 ) 2 ), (m, 6H, Si(CH 3 ) 2 ). 13 C NMR (151 MHz, CDCl 3 ) δ 128.4, 128.2, 127.7, 12, 127.4, 95.9, 82.6, 77.6, 75.3, 75.2, 74.7, S5

6 74.4, 61.2, 52.3, 38., 33.7, 25.2, 2.9, HRMS: m/z: calcd for C 37 H 54 O 1 SiNa: ; found: [M+Na] +. MeOOC HO BnO O OTDS OPivOAc a MeOOC NAPO BnO O OTDS OPivOAc b MeOOC NAPO BnO O OC(NH)CCl 3 OPivOAc 1 S6 27 Scheme S2. Synthesis of glucuronic donor with C-4 2-napthylmethyl ether. Reagents and conditions: a) 2- nathylmethyl bromide, NaH, TBAI, DMF, -2 o C (7%); b) (i) HF:Pyr. THF; (ii) Cl 3 CCN, NaH, DCM. Dimethylthexylsilyl O-methyl-2-O-(4-acetoxy-2,2-dimethylbunoate)-3-O-benzyl-4-O-(2- methyl-napthyl)-β-l-glucupyranosyluronate (S6). To stirring solution of compound 1 (3 mg,.5 mmol) in DMF (5 ml), 2-naphthylmethyl bromide (277 mg, 1.26 mmol) TBAI (2 mg,.1 mmol) and NaH (12 mg,.5 mmol) were added at -2 o C. After stirring for 3 min at -2 o C, TLC analysis (hexanes/etoac, 8/2, v/v) indicated total consumption of starting material. The reaction mixture was quenched with MeOH and was concentrated under reduced pressure. The residue was purified by silica gel column chromatography using a gradient of hexanes/etoac (5/1 1/1, v/v) to give compound S6 as oil (259 mg, 7%). 1 H NMR (3 MHz, CDCl 3 ) δ 7.77 (m, 12H, CH Aromatic), 4.91 (t, J =, 1H, H-2), 4.64 (m, J =11.1 Hz, 6H, CH 2 NAP, 3 CHHBn, H-1), (m, 4H, H-4, H-5, CH 2 PivOAc), (m, 4H, H-3, COOCH 3 ), 1.83 (d, J = Hz, 3H, CH 3 PivOAc), 1.73 (dd, J = 8., 6.3 Hz, 2H, CH 2 PivOAc), (m, 1H, CH(CH 3 ) 2 ), 1.6 (s, 4H, 2 x CH 2 PivOAc), (m, 12H, C(CH 3 ) 2 and CH(CH 3 ) 2 ),.9.6 (m, 6H, Si(CH 3 ) 2 ). 13 C NMR (126 MHz, CDCl 3 ) δ 128.3, 127.9, 127.1, 127., 126.7, 125.9, 125.8, 96.1, 82.3, 78.9, 74.9, 74.8, 74.4, 74.3, 61.3, 52.4, 38., 33.8, 26., 25.3, 25.2, 24.7, 24.1, 2.9, 19.9, HRMS: m/z: calcd for C 41 H 56 O 1 SiNa: ; found: [M+Na] +. S6

7 S7

8 cz-3-53-a_ghsqcad_21391_1 cz-3-53-a f2 (ppm) S8

9 OD93_Proton_Minsw_213Apr3_ S9-4

10 OD93_Ghsqc_213Apr3_ f2 (ppm) S1

11 MestReNova OD S11

12 238 HSQC OD f2 (ppm) S12

13 S13

14 cz-3-53-b_hsqcad_21397_1 cz-3-53-b f2 (ppm) S14

15 S15

16 cz-3-61-omkar_hsqcad_213925_1 STANDARD 1H OBSERVE - profile f2 (ppm) S16

17 OD617_PROTON_21312_1 STANDARD 1H OBSERVE - profile S17

18 OD617_gHSQC_21312_1 OD f2 (ppm) S18

19 S19

20 cz-3-53c_hsqcad_213922_1 cz-3-53c f2 (ppm) S2

21 OD99_Proton_29Mar13_ S21

22 OD99_Hsqc_29Apr13_ f2 (ppm) S22

23 OD25_Proton_Minsw_21May5_1 S23

24 OD25_Ghsqc_21May6_ f2 (ppm) S24

25 S25

26 cz-3-53c_hsqcad_213922_1 cz-3-53c f2 (ppm) S26

27 OD199_Proton_29Dec8_ S27

28 OD427_199_ASAPHMQC_21352_1 OD427_ f2 (ppm) S28

29 S29

30 OD55-GlcA-2-PivAc-4-Fmoc-1-TDS_gHSQC_213429_1 OD55-GlcA-2-PivAc-4-Fmoc-1-TDS f2 (ppm) S3

31 S31-2

32 OD549-F38_Ghsqc_212Jun26_ f2 (ppm) S32

33 S33

34 OD583_gHSQC_212913_1 LH-2 purified dissacharide f2 (ppm) S34

35 OD548-F8_Proton_212Jun25_1 STANDARD 1H OBSERVE - profile S35-2

36 OD548_gHSQC_21351_1 OD f2 (ppm) S36-2

37 OD541_Proton_Minsw_212Jun14_1 STANDARD 1H OBSERVE - profile S37

38 OD541_Ghsqc_212Jun15_ f2 (ppm) S38

39 OD524_Proton_212May14_1 STANDARD 1H OBSERVE - profile S39

40 OD524_Ghsqc_212May14_1 STANDARD 1H OBSERVE - profile STANDARD 1H OBSERVE - profile f2 (ppm) S4

41 OD61_PROTON_212118_1 STANDARD 1H OBSERVE - profile S41

42 f2 (ppm) OD61_gHSQC_212118_1 OD61 S42

43 OD669_PROTON_213422_1 STANDARD 1H OBSERVE - profile S43

44 OD669_gHSQC_213423_1 STANDARD 1H OBSERVE - profile f2 (ppm) S44

45 OD672_PROTON_213423_1 OD S45-2

46 OD672_gHSQC_213423_1 STANDARD 1H OBSERVE - profile f2 (ppm) S46-2

47 OD673_PROTON_213424_1 STANDARD 1H OBSERVE - profile S47

48 OD673_gHSQC_213425_1 OD f2 (ppm) S48

49 OD674_PROTON_213426_1 STANDARD 1H OBSERVE - profile S49

50 OD674_gHSQC_213426_1 After sulfation and saponification f2 (ppm) S5

51 S51. -

52 cz-3-1_nac ghsqc_213429_1 Disaccharide with NAc next step is deprotection f2 (ppm) S52

53 cz-3-11_ghsqc_21343_1 STANDARD 1H OBSERVE - profile f2 (ppm) S53

54 S54-1

55 S55

56 2-78_Ghsqc_213Mar7_ f2 (ppm) S56

57 38 S57

58 OD-514_PROTON_213429_2 STANDARD 1H OBSERVE - profile S58

59 OD-514_gHSQC_213429_1 STANDARD 1H OBSERVE - profile f2 (ppm) S59

60 525 Proton OD-OHCOOMe S6

61 525 HSQC OD-OHCOOMe f2 (ppm) S61 15

62 OD544_PROTON_21343_1 STANDARD 1H OBSERVE - profile S62

63 OD544_gHSQC_21343_1 GlcA-2-Ac-4-Bn-1-OH f2 (ppm) S63

64 OD528_PROTON_213429_1 STANDARD 1H OBSERVE - profile S64

65 OD528_gHSQC_213429_1 GlcA-2-Lev-1-TDS f2 (ppm) S65

66 OD521_PROTON_213429_1 STANDARD 1H OBSERVE - profile S66

67 OD521_gHSQC_213429_1 GlcA-2-PivOAc-4-Bn f2 (ppm) S67

68 OD597-F8_Proton_212Nov1_1 Column purified S68

69 OD597-F3_gHSQC_212112_1 Column purified f2 (ppm) S69

70 OD548-F38_Proton_212Jun25_1 STANDARD 1H OBSERVE - profile S7-2

71 OD548-F38_Ghsqc_212Jun25_1 STANDARD 1H OBSERVE - profile STANDARD 1H OBSERVE - profile f2 (ppm) S71