Catalytic Enantioselective Fluorination and Amination of β-Keto Phosphonates Catalyzed by Chiral Palladium Complexes
作者:Sung Min Kim、Hye Ran Kim、Dae Young Kim
DOI:10.1021/ol050413a
日期:2005.6.1
[reaction: see text] The catalytic enantioselective fluorination and amination of beta-keto phosphonates catalyzed by chiral palladiumcomplexes is described. Treatment of beta-keto phosphonates with N-fluorobenzenesulfonimide (NFSI) as electrophilic fluorinating reagent and diethyl azodicarboxylate (DEAD) as electrophilic amination reagent under mild reaction conditions afforded the corresponding alpha-substituted
A series of alpha-mono- and alpha,alpha-difluoro-beta-ketophosphonates were synthesized in moderate to good yields with excellent selectivities via electrophilic fluorination by Selectfluor. Subsequently, synthetic potential of the obtained alpha-monofluoro-beta-ketophosphonates was demonstrated by their application in synthesis of alpha-monofluoro-beta-aminophosphonates, useful building blocks in the preparation of phosphapeptides.