A One-Pot Procedure for the Regiocontrolled Synthesis of Allyltriazoles via the Pd−Cu Bimetallic Catalyzed Three-Component Coupling Reaction of Nonactivated Terminal Alkynes, Allyl Carbonate, and Trimethylsilyl Azide
作者:Shin Kamijo、Tienan Jin、Zhibao Huo、Yoshinori Yamamoto
DOI:10.1021/jo035292b
日期:2004.4.1
A one-pot procedure for the regiocontrolled synthesis of both 2-allyl- and 1-allyl-1,2,3-triazoles via the three-component coupling (TCC) reaction between nonactivated terminal alkynes, allyl carbonate, and trimethylsilyl azide (TMSN3) under a palladium and copper bimetallic catalyst has been developed. To accomplish the regioselective synthesis of the allyltriazoles, proper choice of two different
一锅法,用于通过非活化末端炔烃,碳酸烯丙酯和叠氮化三甲基硅烷基(TMSN)之间的三组分偶联(TCC)反应进行2-烯丙基-和1-烯丙基-1,2,3-三唑的区域控制合成3)已经开发了钯和铜双金属催化剂。为了实现allyltriazoles的区域选择性合成,需要两种不同的催化剂体系的适当的选择。Pd 2(dba)3 ·CHCl 3 -CuCl(PPh 3)3 -P(OPh)3的组合催化2-烯丙基-1,2,3-三唑的形成,而Pd(OAc)2的组合-铜溴2 -PPh 3促进1-烯丙基-1,2,3-三唑的形成。钯和铜催化剂的协同活性在目前的转化中起重要作用。钯催化剂最有可能用作产生反应性叠氮化物种类,π-烯丙基钯叠氮化物络合物和烯丙基叠氮化物的催化剂。铜催化剂可能通过形成乙炔铜中间体而充当起始端炔烃的C-C三键的活化剂,从而促进了反应性叠氮化物与乙炔铜之间的[3 + 2]-环加成反应。形成三唑骨架。