Asymmetric synthesis of both enantiomers of novel tetracyclic heterocycle, furo[3′,2′:2,3]pyrrolo[2,1-a]isoquinoline derivative via a diastereoselective N-acyliminium ion cyclization
作者:Jae Yeol Lee、Yong Sup Lee、Bong Young Chung、Hokoon Park
DOI:10.1016/s0040-4020(96)01179-9
日期:1997.2
An efficientsynthesis of both enantiomers of tetracyclic isoquinoline derivative (−)-2 and (+)-2 was accomplished starting from L-malic acid and L-tartaric acid, respectively. The key step is the stereoselective introduction of quaternary carbon-center in ring juncture using a diastereoselectiveN-acyliminiumioncyclization of chiral enamides (1, 3).