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
cleavage/phosphorothiolation cascade is presented. This protocol features mild and redox neutral conditions, wide substrate scope and easy scalability, allowing straightforward access to functionalized S-alkyl organophosphorus compounds in moderate to good yields.
Alkoxy radical accelerated β-fragmentation of alcohols and lactols
作者:James H Rigby、Anne Payen、Namal Warshakoon
DOI:10.1016/s0040-4039(01)00121-6
日期:2001.3
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.