Total synthesis of (5R,6R,8R,9S)-(−)-5,9Z-indolizidine 221T using sulfinimine-derived N-sulfinyl β-amino ketones
作者:Franklin A. Davis、Minsoo Song、Hui Qiu、Jing Chai
DOI:10.1039/b915796d
日期:——
The first total asymmetric synthesis of the poison frog alkaloid (−)-221T, a 5,6,8-trisubstituted indolizidine is described. The key core piperidine ring was constructed via an acid catalyzed intramolecular cascade Mannich cyclization reaction of a N-sulfinyl syn-α-methyl β-amino ketone and crotonaldehyde. The β-amino ketone was prepared via the reaction of prochiral lithium Weinreb amide enolate with
描述了毒蛙生物碱(-)-221T(5,6,8-三取代的吲哚并立定)的首次完全不对称合成。关键核心哌啶环,构建通过酸催化的分子内级联曼尼希内环化反应ñ -亚磺酰基顺-α-β甲基氨基酮和巴豆醛。β-氨基酮是通过前手性Weinreb酰胺烯醇锂与对映体纯的N -2,4,6-三异丙基苯基亚磺酰基亚胺反应制得的。