作者:Nan Huang、Tao Jiang、Tiansheng Wang、Mustapha Soukri、Rakesh Ganorkar、Bruce Deker、Jean-Michel Léger、Jose Madalengoitia、Martin E. Kuehne
DOI:10.1016/j.tet.2008.07.044
日期:2008.10
Condensation of methyl 3-benzyl-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole-5-carboxylate (3) with methyl Z-4-formylhex-3-enoate (6) gave cis-fused dimethyl 5-benzyl-4-ethyl-2,4a,5,6,7,12-hexahydro-1H-benzo[2,3]azepino[4,5-b]indole-2,12b-dicarboxylate and its trans-fused diastereomer. Selective reduction of the less hindered ester group with sodium borohydride to an alcohol ester, tosylation, debenzylation
3-苄基1,2,3,4,5,6-六氢氮杂环庚烷[4,5- b ]吲哚-5-羧酸甲酯(3)与Z -4-甲酰基己基-3-烯酸酯甲基(6)的缩合反应顺式稠合的二甲基5-苄基-4-乙基-2,4a,5,6,7,12-六氢-1 H-苯并[2,3] azepino [4,5 - b ]吲哚-2,12b-二羧酸酯及其反式非对映异构体。用硼氢化钠将较少受阻的酯基选择性还原为醇酯,进行甲苯磺酸化,脱苄基化和环化反应,得到外消旋的catharanthine(1)。