Dichotomy within 1,4-addition of organolithium and Grignard reagents to α,β-unsaturated Fischer alkoxycarbenes: A new synthesis of Fischer carbenes
作者:Tomáš Tobrman、Peter Polák、Marek Čubiňák、Hana Dvořáková、Dalimil Dvořák
DOI:10.1016/j.tet.2019.02.038
日期:2019.4
The reaction of organolithium and Grignard reagents with pentacarbonyl[(ethoxy)(2-phenylethenyl)carbene]chromium(0) gave, after the quenching of the initially formed product of the 1,4-addition, different products depending on the organometallic and quenching reagents used. The addition of organolithiums, followed by a work-up with acid (AcOH or HCl), afforded the corresponding carbene complexes. In
有机锂和格氏试剂与五羰基[(乙氧基)(2-苯基乙烯基)碳烯]铬(0)的反应,在最初形成的1,4-加成产物淬灭后,根据有机金属和淬灭反应,可得到不同的产物使用的试剂。加入有机锂,然后用酸(AcOH或HCl)进行后处理,得到相应的卡宾配合物。相反,用乙醇淬灭反应混合物导致(Z)-烯醇醚的立体选择性形成。无论使用哪种淬灭剂,格利雅试剂的使用都会导致卡宾配合物的形成。