Synthesis of Cyclopropanes by Intramolecular Attack ofN-Nucleophiles on the Central Carbon of (π-Allyl)palladium Complexes
作者:Ronald Grigg、Markus Kordes
DOI:10.1002/1099-0690(200102)2001:4<707::aid-ejoc707>3.0.co;2-i
日期:2001.2
amounts of palladium(0) complexes to form cyclopropanes such as 3a. This reaction is believed to proceed via an intermediate palladacyclobutane and is the first example of a noncarbon nucleophile attack on the centre carbon of an (η3-allyl)palladium complex leading, by reductive elimination, to cyclopropanes. The regiochemistry of the nucleophilic attack (central versus terminal carbon) depends on the nature
邻-卤代苯甲酰胺如化合物 1a 在丙二烯和碱存在下与催化量的钯 (0) 络合物反应形成环丙烷如 3a。该反应被认为是通过中间体钯环丁烷进行的,并且是非碳亲核试剂攻击(η3-烯丙基)钯配合物的中心碳的第一个例子,通过还原消除导致环丙烷。亲核攻击的区域化学(中心碳与末端碳)取决于配体和溶剂的性质,因为富电子钯配合物有利于中心碳攻击。