Abstract
A highly regioselective, one-pot, double Suzuki cross-coupling procedure for the construction of 2,5- and 2,3-diaryl pyridines is described. Starting from 2,3- and/or 2,5-dibromopyridines, sequential regioselective coupling with aryl- and alkenylboronic acids to give the disubstituted pyridines in reasonable to good yields was achieved. Interestingly, the modest isolated yields of many of the products increased (by approximately 20%) with purification on neutral alumina instead of silica gel flash chromatography.
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