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。
Straightforward Methodology for the Enantioselective Synthesis of Benzo[<i>a</i>]- and Indolo[2,3-<i>a</i>]quinolizidines
作者:Mercedes Amat、Maria M. M. Santos、Oriol Bassas、Núria Llor、Carmen Escolano、Arantxa Gómez-Esqué、Elies Molins、Steven M. Allin、Vickie McKee、Joan Bosch
DOI:10.1021/jo070539g
日期:2007.7.1
substituted benzo[a]- and indolo[2,3-a]quinolizidines has been developed. It consists of (i) a stereoselective cyclocondensation of a racemic or prochiral δ-oxo(di)ester with either (S)-(3,4-dimethoxyphenyl)alaninol or (S)-tryptophanol in a process involving a dynamic kinetic resolution and/or the differentiation of enantiotopic or diastereotopic ester groups, and (ii) a subsequent stereocontrolled cyclization
已开发出对苯并[ a ]-和吲哚并[2,3- a ]喹啉联苯胺的对映选择性两步法。它由(i)外消旋或前手性δ-氧代(二)酯与(S)-(3,4-二甲氧基苯基)丙氨醇或(S)-色氨酸的立体选择性环缩合反应涉及动态动力学拆分和/或对映体或非对映体酯基的区分,和(ii)随后利用所得恶唑并哌啶酮内酰胺中存在的被掩蔽的N-酰基亚氨基亚胺离子在芳环上进行立体控制环化。
Biogenetically Inspired Enantioselective Approach to Indolo[2,3-<i>a</i>]- and Benzo[<i>a</i>]quinolizidine Alkaloids from a Synthetic Equivalent of Secologanin
作者:Oriol Bassas、Núria Llor、Maria M. M. Santos、Rosa Griera、Elies Molins、Mercedes Amat、Joan Bosch
DOI:10.1021/ol0505609
日期:2005.7.1
oxodiester 1 undergoes stereoselective cyclocondensation with (S)-tryptophanol, (S)-(3,4-dimethoxyphenyl)alaninol, or the corresponding amino acids, in a process involving a tandem dynamic kinetic resolution/desymmetrization of diastereotopic groups, to give bicyclic lactams, which are cyclized to substituted indolo[2,3-a]- and benzo[a]quinolizidines.
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。