Iridium-catalyzed asymmetric ring-opening of azabicyclic alkenes with alcohols
作者:Dingqiao Yang、Jiuyun Xia、Yuhua Long、Zhongyi Zeng、Xiongjun Zuo、Sanyong Wang、Chunrong Li
DOI:10.1039/c3ob40891d
日期:——
A novel asymmetric ring-opening reaction of N-substituted azabenzonorbornadienes with a wide variety of substituted benzyl alcohols and the addition reaction of N-substituted azabenzonorbornadienes with thiols are reported, affording the corresponding 1,2-trans-alkoxyamino products in moderate yields with excellent enantioselectivities (up to 94% ee) and the corresponding thiol addition products in high yields with lower enantiomeric excesses (ee) in the presence of iridium catalyst, respectively. The effects of ligands, catalyst loading, solvents and additives, and temperature were also investigated. The anti-configuration of the product 3c was confirmed by X-ray crystal structure analysis. A possible mechanism for the present catalytic reaction is proposed.