Highly stereoselective construction of trans(2,3)-cis(2,6)-trisubstituted piperidines: An application to the chiral synthesis of Dendrobates alkaloids
作者:Naoki Toyooka、Keiko Tanaka、Takefumi Momose、John W Daly、H.Martin Garraffo
DOI:10.1016/s0040-4020(97)00641-8
日期:1997.7
indolizidine and 1,4-disubstituted quinolizidine system found in Dendrobates alkaloids has been developed. The key step for this synthesis is the highly stereoselective Michael reaction of a didehydropiperidinecarboxylate (1) to afford a trans(2,3)-cis(2,6)-trisubstituted piperidine. In this manner, the chiral formal synthesis of indolizidines 207A and 209B and the total synthesis of indolizidines
已开发出一种通向Dendrobates生物碱中的5,8-二取代的吲哚并立核苷和1,4-二取代的喹oli嗪系的通用且灵活的途径。该合成的关键步骤是二脱氢哌啶羧酸酯(1)的高度立体选择性迈克尔反应,得到反式(2,3)-顺式(2,6)-三取代哌啶。以这种方式,已经实现了吲哚并咪唑207A和209B的手性形式合成以及喹啉并咪唑207I的吲哚并咪唑223J,235B'和Cl-顶基的总合成。