Dedicated to Professor Grzegorz Mlostoń on the occasion of his 70th birthday.
Abstract
Vitamin B12 plays a crucial role in enzymatic transformations. This natural compound proved also
useful as a catalyst in numerous organic reactions. Commercial availability and lower
cost than precious metal complexes, make cobalamin an attractive candidate for a broader
use as a benign Co-catalyst. Herein, the vitamin B12-catalyzed dicarbofuntionalization of bromoalkenes with electrophilic olefins is reported
leading to substituted pyrrolidines and piperidines in decent yields after only 15
minutes under light irradiation.
Key words
cobalt - vitamin B12 - radical cyclization - Giese addition