Bimetallic catalysis: The first palladium catalysts capable of controlling asymmetric nucleophilic allylations of aldehydes with allyltributyltin are reported. Unprecedented TONs for this reaction type were achieved (up to 620). The method is also tolerating electronically and sterically unfavorable substrates. A transmetallation occurs, favoring an η1-allyl coordination mode with the reported bispalladacycle
双
金属催化:报道了第一个能够控制醛与
烯丙基三丁基锡的不对称亲核烯丙基化的
钯催化剂。这种反应类型的 TON 达到了前所未有的
水平(高达 620)。该方法还可以容忍电子和空间上不利的底物。发生
金属转移,有利于 η 1 -烯丙基配位模式与报道的双
钯环催化剂,而对于相应的单
钯环催化剂,非生产性的 η 3 -配位占主导地位。