Zirconium-Mediated Cross-Coupling of Terminal Alkynes and Vinyl Bromides: Selective Synthesis of Cyclobutene and 1,3-Diene Derivatives
作者:José Barluenga、Félix Rodríguez、Lucía Álvarez-Rodrigo、Francisco J. Fañanás
DOI:10.1002/chem.200305337
日期:2004.1.5
diastereoselective synthesis of 1,3-butadiene or cyclobutene derivatives by a zirconium-mediated reaction of alkenyllithium compounds and vinyl bromides is reported. The key steps involve the generation of zirconocene-alkyne complexes from haloalkenes and subsequent coupling with alkenyl bromides. Thus, formally the process supposes the cross-coupling reaction between a terminal alkyne and an alkenyl bromide. Moreover
据报道,通过锆介导的链烯基锂化合物和乙烯基溴的非对映选择性合成1,3-丁二烯或环丁烯衍生物。关键步骤涉及从卤代烯烃生成锆茂-炔烃配合物,然后与烯基溴化物偶联。因此,正式地,该方法假定末端炔烃和烯基溴化物之间发生交叉偶联反应。此外,使用丁基乙烯基醚代替溴乙烯作为不饱和体系可以替代地获得不同的1,3-丁二烯区域异构体。