Reaction of [(Z)-1-bromo-1-alkenyl]dialkylboranes with N-halogeno compound in THF–DMF: a novel synthesis of 1,2-disubstituted (E)-vinyl bromides
摘要:
DMF-induced reaction of [(Z)-1-bromo-1-alkenyl]dialkylboranes with an N-halogeno compound results in 1,2-migration of an alkyl group from the dialkylboryl group to the alpha-carbon atom without elimination of the bromine atom, followed by beta-elimination to provide 1,2-disubstituted (E)-vinyl bromides stereoselectively in good yields. (C) 2000 Elsevier Science Ltd. All rights reserved.
Stereoselective Synthesis of (E)- and (Z)-1-Alkenyltributylstannanes From (E)- and (Z)-1-Alkenyldialkylboranes Using a Cross-Coupling Reaction with Tributyltin Halide