Biaryl formation using the suzuki protocol: Considerations of base, halide, and protecting group.
作者:John W. Benbow、Bonnie L. Martinez
DOI:10.1016/s0040-4039(96)02065-5
日期:1996.12
The generation of aryl anions prior to quenching with a trialkyl borate has been shown to be sensitive to the composition of the aryl substrate. Aryl iodides containing remote benzyl ether substituents undergo trans-metallation with sec-BuLi to cleanly give the desired aryl anions whereas the corresponding bromides afford appreciable quantities of dianionic intermediates. The arylboronic acids derived from alkylation of these anions subsequently undergo a palladium mediated coupling with aryl halides to provide good yields of the desired biaryls. Copyright (C) 1996 Elsevier Science Ltd.