Gold‐Catalyzed [3+2]‐Annulations of α‐Aryl Diazoketones with the Tetrasubstituted Alkenes of Cyclopentadienes: High Stereoselectivity and Enantioselectivity
作者:Ching‐Nung Chen、Wei‐Min Cheng、Jian‐Kai Wang、Tzu‐Hsuan Chao、Mu‐Jeng Cheng、Rai‐Shung Liu
DOI:10.1002/anie.202012611
日期:2021.2.23
This work reports gold‐catalyzed [3+2]‐annulations of α‐diazo ketones with highly substituted cyclopentadienes, affording bicyclic 2,3‐dihydrofurans with high regio‐ and stereoselectivity. The reactions highlights the first success of tetrasubstituted alkenes to undergo [3+2]‐annulations with α‐diazo carbonyls. The enantioselective annulations are also achieved with high enantioselectivity using chiral
这项工作报道了用高取代的环戊二烯进行金催化的α-重氮酮的[3 + 2]环化反应,从而提供具有高区域和立体选择性的双环2,3-二氢呋喃。该反应突出表明四取代烯烃首次成功经历了与α-重氮羰基的[3 + 2]环化反应。使用金和磷酸的手性形式,还以高对映选择性实现对映选择性环化。我们的机理分析支持环戊二烯充当亲核试剂,以攻击更多取代的烯烃上的金卡宾,产生与手性磷酸络合的烯醇金,以增强对映选择性。