Biomimetic Cyclization of Enamide-Containing Polyenes as a New Route to Azapolycycles
作者:Stephanie E. Sen、Steven L. Roach
DOI:10.1021/jo960924y
日期:1996.1.1
Enamide 4 was studied for its effectiveness as a polyene precursor in biomimetic cyclizations. While most conventional Lewis acids were poor cyclization promoters, FeCl(3).6H(2)O initiated the conversion of 4 into tricycles 6 and 7 in excellent yield. The two isomeric products result from the cyclization of intermediate aldehyde 5 by either a chair or boat B-ring transition state. These results suggest
研究了酰胺4在仿生环化中作为多烯前体的有效性。虽然大多数常规路易斯酸是弱环化促进剂,FeCl(3).6H(2)O引发4转化成三环6和7的优良产量。这两种异构产物是由椅子或船用B环过渡态使中间醛5环化而产生的。这些结果表明,可以将烯酰胺掺入多烯前体中以用于构建较大的氮杂多环,例如氮杂类固醇。