作者:Hanchao Cheng、Dingqiao Yang
DOI:10.1021/jo3018507
日期:2012.11.2
A novel iridium-catalyzed asymmetric ring-opening (ARO) reaction of oxabenzonorbornadienes with a variety of phenols was reported, which afforded the corresponding trans-2-phenoxy-1,2-dihydronaphthalen-1-ol products in high yields with moderate to excellent enantioselectivities (up to 98% ee) under mild conditions. The trans products are formed via the enantioselective cleavage of a bridgehead carbon–oxygen
报道了一种新颖的铱催化的草酰苯并降冰片二烯与多种酚的不对称开环(ARO)反应,可高产率提供相应的反式-2-苯氧基-1,2-二氢萘-1-醇产物,中等至极好在温和条件下的对映选择性(高达98%ee)。反式产物通过一个桥头碳-氧键的对映选择性裂解而形成的1其后是S Ñ由酚类2亲核攻击。还研究了各种双膦配体,Ag(I)盐,卤化铵,碱和溶剂对反应收率和对映选择性的影响。产品2a的反式配置通过X射线晶体结构分析确认。提出了本催化反应的可能机理。