Alkoxy radical accelerated β-fragmentation of alcohols and lactols
摘要:
Treatment of alcohols and lactols with Pb(OAc)(4)/Cu(OAc)(2) in refluxing benzene provides the corresponding delta -unsaturated carbonyl products. (C) 2001 Elsevier Science Ltd. All rights reserved.
An inexpensive iron-catalyzed alkoxyl radical-induced C–C bond cleavage/gem-difluoroalkylation cascade is presented. Regulated by the structure of alkoxyl radical precursors, fluorinated distal diketones were synthesized through a ring-opening strategy and difluoroalkylated medium-sized lactones and macrolactones were constructed via a ring-expansion strategy. Both protocols proceeded under mild and