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.
报道了一种新颖的N取代氮杂苯并双环烯的非对称开环反应,使用了多种取代苄醇,以及N取代氮杂苯并双环烯与硫醇的加成反应,分别获得了相应的1,2-trans-烷氧基氨基产物,产率适中且手性选择性优异(高达94% ee),以及在铱催化剂存在下高产率的相应硫醇加成产物,但手性过量(ee)较低。此外,还研究了配体、催化剂用量、溶剂和添加剂及温度的影响。通过X射线晶体结构分析确认了产物3c的反反式构型。提出了一种可能的催化反应机制。