The first stereocontrolled synthesis of 12-methyl-hexahydrobenzo[c]phenanthridine alkaloids
作者:Jose L. Vicario、Dolores Badı́a、Esther Domı́nguez、Ana Crespo、Luisa Carrillo
DOI:10.1016/s0957-4166(99)00167-6
日期:1999.5
synthesized stereoselectively starting from chiral nonracemic 2-aryl-4-pentenoic acids prepared by asymmetric allylation of (+)-(S,S)-pseudoephedrine-based arylacetamide enolates. Subsequent transformations (Friedel–Crafts acylation, stereocontrolled reductive amination, Pictet–Spengler cyclization and PPA catalyzed cationic cyclization) led to the synthesis of enantiomerically enriched hexahydroben
从通过(+)-(S,S)-伪麻黄碱基芳基乙酰胺烯醇酸酯的不对称烯丙基化制备的手性非外消旋2-芳基-2-芳基-4-戊烯酸开始,立体选择性地合成了12-甲基B / C六氢苯并[ c ]菲啶。随后的转化(Friedel-Crafts酰化,立体控制的还原胺化,Pictet-Spengler环化和PPA催化的阳离子环化)导致了对映体富集的六氢苯并[ c ]菲啶的合成,其中所有新的立体异构中心的顺序形成均由起始位点控制手性酸。