Regioselective Nucleophilic Addition of Organometallic Reagents to 3-Geminal Bis(silyl) <i>N</i>-Acyl Pyridinium
作者:Ya Wu、Linjie Li、Hongze Li、Lu Gao、Hengmu Xie、Zhigao Zhang、Zhishan Su、Changwei Hu、Zhenlei Song
DOI:10.1021/ol500302r
日期:2014.4.4
bis(silyl) N-acyl pyridinium has been described. Geminal bis(silane) shows contrasting roles that lead to different regioselectivities for the addition of different nucleophiles: its steric effect dominates to favor 1,6-addition of alkyl, vinyl, and aryl organometallic reagents; its directing effect dominates to favor 1,2-addition of less sterically demanding alkynyl Grignard reagents.
已经描述了向3-二元双(甲硅烷基)N-酰基吡啶鎓的区域选择性亲核加成。双组分双(硅烷)显示出相反的作用,导致添加不同亲核试剂时具有不同的区域选择性:其空间效应占优势,有利于烷基,乙烯基和芳基有机金属试剂的1,6-加成;其指导作用占优势,有利于减少空间要求较低的炔基格利雅试剂的1,2-加成。