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【结 构 式】 
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【分子编号】57116 【品名】S-phenyl (2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenethioate 【CA登记号】 |
【 分 子 式 】C33H44O5SSi 【 分 子 量 】580.86086 【元素组成】C 68.24% H 7.64% O 13.77% S 5.52% Si 4.84% |
合成路线1
该中间体在本合成路线中的序号：(VII)The condensation of the chiral imide (I) with aldehyde (II) by means of Et2B-OTf and DIEA in dichloromethane gives the hydroxy-imide (III), which is protected with Tbdms-Cl and imidazole to yield the silyl ether (IV). The cleavage of the chiral auxiliary of (IV), followed by reduction with DIBAL in THF affords the aldehyde (V), which is condensed with the silylated enol ether (VI) by means of SnCl4 in dichloromethane to provide the target intermediate, the phenyl thioester (VII).
| 【1】 Boeckman, R.K.; Clark, T.J.; Shook, B.C.; A practical enantioselective total synthesis of the bengamides B, E, and Z. Org Lett 2002, 4, 12, 2109. |
| 【2】 Boeckman, R.K.; et al.; The development of a convergent and efficient enantioselective synthesis of the bengamides via a common polyol intermediate. Helv Chim Acta 2002, 85, 12, 4532. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (I) | 57110 | 4,5,5-trimethyl-2-[2-(2-naphthyloxy)acetyl]-2-azabicyclo[2.2.1]heptan-3-one | C21H23NO3 | 详情 | 详情 | |
| (II) | 57111 | 4-Methyl-2-pentenal | 5362-56-1 | C6H10O | 详情 | 详情 |
| (III) | 57112 | 2-[(2S,3R,4E)-3-hydroxy-6-methyl-2-(2-naphthyloxy)-4-heptenoyl]-4,5,5-trimethyl-2-azabicyclo[2.2.1]heptan-3-one | C27H33NO4 | 详情 | 详情 | |
| (IV) | 57113 | 2-[(2S,3R,4E)-3-{[tert-butyl(dimethyl)silyl]oxy}-6-methyl-2-(2-naphthyloxy)-4-heptenoyl]-4,5,5-trimethyl-2-azabicyclo[2.2.1]heptan-3-one | C33H47NO4Si | 详情 | 详情 | |
| (V) | 57114 | (2S,3R,4E)-3-{[tert-butyl(dimethyl)silyl]oxy}-6-methyl-2-(2-naphthyloxy)-4-heptenal | C24H34O3Si | 详情 | 详情 | |
| (VI) | 57115 | (Z)-2-methoxy-1-(phenylsulfanyl)ethenyl trimethylsilyl ether; {[(Z)-2-methoxy-1-(phenylsulfanyl)ethenyl]oxy}(trimethyl)silane | C12H18O2SSi | 详情 | 详情 | |
| (VII) | 57116 | S-phenyl (2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenethioate | C33H44O5SSi | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(VII)The cyclization of 2(R)-bromobutane-1,4-diol (VIII) by means of NaH in THF, followed by acylation with Ts-Cl gives the chiral epoxide (IX), which is treated with NaI in hot acetone to yield the iodo-epoxide (X). The enantiocontrolled condensation of (X) with the commercial imine (XI) by means of Cs-OH catalyzed by a chiral phase transfer catalyst affords the epoxy iminoester (XII). The reaction of the epoxy group of (XII) with N-methylbenzylamine in methanol provides the expected amino-alcohol (XIII), which is treated with citric acid to hydrolyze the imino group to give amine (XIV). Elimination of the benzyl protecting group of (XIV) by means of H2 over Pd/C yields the diamino ester (XV), which is cyclized to the hydroxy-caprolactam (XVI) by reaction with Na-OMe in methanol at 80 C in a sealed tube. The reaction of the OH group of (XVI) with tetradecanoyl chloride (XVII) by means of TFA affords the corresponding ester (XVIII). The condensation of the amino group of (XVIII) with the intermediate phenyl thioester (VII) in refluxing dioxane provides the corresponding amide (XIX), which is finally deprotected by a first treatment with DDQ in water/methanol/dichloromethane, followed by desilylation with PPTS in hot methanol/dichloromethane to yield the target bengamide B.
| 【1】 Boeckman, R.K.; Clark, T.J.; Shook, B.C.; A practical enantioselective total synthesis of the bengamides B, E, and Z. Org Lett 2002, 4, 12, 2109. |
| 【2】 Boeckman, R.K.; et al.; The development of a convergent and efficient enantioselective synthesis of the bengamides via a common polyol intermediate. Helv Chim Acta 2002, 85, 12, 4532. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (VII) | 57116 | S-phenyl (2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenethioate | C33H44O5SSi | 详情 | 详情 | |
| (VIII) | 57126 | (2R)-2-bromo-1,4-butanediol | C4H9BrO2 | 详情 | 详情 | |
| (IX) | 57117 | 2-[(2S)oxiranyl]ethyl 4-methylbenzenesulfonate | C11H14O4S | 详情 | 详情 | |
| (X) | 57118 | (2S)-2-(2-iodoethyl)oxirane | C4H7IO | 详情 | 详情 | |
| (XI) | 57119 | tert-butyl 2-[(diphenylmethylene)amino]acetate | C19H21NO2 | 详情 | 详情 | |
| (XII) | 57120 | tert-butyl (2S)-2-[(diphenylmethylene)amino]-4-[(2S)oxiranyl]butanoate | C23H27NO3 | 详情 | 详情 | |
| (XIII) | 57121 | tert-butyl (2S,5S)-6-[benzyl(methyl)amino]-2-[(diphenylmethylene)amino]-5-hydroxyhexanoate | C31H38N2O3 | 详情 | 详情 | |
| (XIV) | 57122 | tert-butyl (2S,5S)-2-amino-6-[benzyl(methyl)amino]-5-hydroxyhexanoate | C18H30N2O3 | 详情 | 详情 | |
| (XV) | 57123 | tert-butyl (2S,5S)-2-amino-5-hydroxy-6-(methylamino)hexanoate | C11H24N2O3 | 详情 | 详情 | |
| (XVI) | 57124 | (3S,6S)-3-amino-6-hydroxy-1-methyl-2-azepanone | C7H14N2O2 | 详情 | 详情 | |
| (XVII) | 30295 | tetradecanoyl chloride | 112-64-1 | C14H27ClO | 详情 | 详情 |
| (XVIII) | 47783 | (3S,6S)-6-amino-1-methyl-7-oxoazepanyl myristate | C21H40N2O3 | 详情 | 详情 | |
| (XIX) | 57125 | (3S,6S)-6-{[(2R,3S,4R,5R,6E)-5-{[tert-butyl(dimethyl)silyl]oxy}-3-hydroxy-2-methoxy-8-methyl-4-(2-naphthyloxy)-6-nonenoyl]amino}-1-methyl-7-oxoazepanyl myristate | C48H78N2O8Si | 详情 | 详情 |