An Asymmetric Route to the Conanine BCDE Ring System. A Formal Total Synthesis of (+)-Conessine
作者:Michael E. Kopach、Andrew H. Fray、A. I. Meyers
DOI:10.1021/ja961903o
日期:1996.1.1
The first enantioselectivesynthesis of the known (+)-conessine precursor (+)-benzohydrindan 23 from the chiral nonracemic bicyclic lactam 1 is described. The key transformation was the highly diastereoselective (3 + 2) cycloaddition of azomethine ylide 11a to lactam 7 in order to construct the pyrrolidine E ring system at any early stage in the synthesis. The requisite pyrrolidine methyl group at