Reduction of alpha-bromosulfones 1, 5, 13-16 by cat.(PhSe)(2)/NaBH4 occurred site-selectively in high yields. This reduction of 1,3- or 1,4-dibromobis(sulfone) 21 and 25 was applied to intramolecular coupling reactions to give the three- and four-membered carbocycles 26-28. (C) 1997 Elsevier Science Ltd.
Reduction of alpha-bromosulfones 1, 5, 13-16 by cat.(PhSe)(2)/NaBH4 occurred site-selectively in high yields. This reduction of 1,3- or 1,4-dibromobis(sulfone) 21 and 25 was applied to intramolecular coupling reactions to give the three- and four-membered carbocycles 26-28. (C) 1997 Elsevier Science Ltd.