Exposure of a variety of mono- and disubstituted ortho-alkenylarylboronic acids to NBS in THF/ H2O under neutral conditions affords bromo-boronolactones, in some instances, with exceptional regiocontrol. The adducts, analogous to those formed by carboxylic acids, are shown to be useful synthetic intermediates.
Exposure of a variety of mono- and disubstituted ortho-alkenylarylboronic acids to NBS in THF/ H2O under neutral conditions affords bromo-boronolactones, in some instances, with exceptional regiocontrol. The adducts, analogous to those formed by carboxylic acids, are shown to be useful synthetic intermediates.
Homocoupling of alkyl-, alkenyl-, and arylboronic acids
作者:J.R. Falck、Suchismita Mohapatra、Muralidhar Bondlela、Sylesh K. Venkataraman
DOI:10.1016/s0040-4039(02)01897-x
日期:2002.11
Alkyl-, alkenyl-, and arylboronic acids undergo Ag2O/CrCl2, mediated homocoupling in moderate to good yields under mild conditions. The general utility of this methodology is illustrated by an intramolecular annulation between sp and sp(3) centers. (C) 2002 Published by Elsevier Science Ltd.