Enantioselective Formal Synthesis of (+)-Dihydrocorynantheine and (−)-Dihydrocorynantheol
作者:Mercedes Amat、Arantxa Gómez-Esqué、Carmen Escolano、Maria M. M. Santos、Elies Molins、Joan Bosch
DOI:10.1021/jo802387c
日期:2009.2.6
involving oxidation to an aldehyde, dehydration of the corresponding oxime, and reductive decyanation of the resulting α-aminonitrile, has been developed. The preparation of indoloquinolizidine 27 represents a formal total synthesis of (+)-dihydrocorynantheine, (−)-dihydrocorynantheol, and other indolo[2,3-a]quinolizidine and oxindole alkaloids bearing the same substitution pattern.
据报道,存在于众多吲哚生物碱中的3-乙基吲哚并[2,3- a ]喹唑烷部分的对映选择性结构,关键步骤是(S)-色氨酸与适当的外消旋δ-氧酸酯和区域-和-区域的立体选择性环缩合。内酰胺羰基上的恶唑并哌啶酮的立体选择性环化。已经开发出一种新的除去羟甲基辅助基团的方法,该方法包括氧化成醛,相应的肟脱水以及所得的α-氨基腈还原性脱氰。吲哚并喹唑啉27的制备代表了(+)-二氢红ry烷,(-)-二氢红ry酚和其他吲哚[2,3- a]的正式全合成。] quinolizidine和oxindole生物碱具有相同的取代方式。