KIM, DAE YOUNG;YOUNG, OH DONG, SYNTH. COMMUN., 17,(1987) N 8, 953-957
作者:KIM, DAE YOUNG、YOUNG, OH DONG
DOI:——
日期:——
Asymmetric Electrophilic Fluorination of α-Cyanoalkylphosphonates Catalyzed by Chiral Palladium Complexes
作者:Dae Kim、Young Kang、Min Cho、Sun Kim
DOI:10.1055/s-2007-977436
日期:2007.4
The catalytic enantioselective fluorination of α-cyanoalkylphosphonates catalyzed by chiral palladium complexes was examined. Treatment of α-cyanoalkylphosphonates with N-fluorobenzenesulfonimide as the electrophilic fluorinating reagent under mild reaction conditions afforded the corresponding α-fluorinated α-cyanoalkylphosphonates in excellent yields with high enantiomeric excesses (80-91%).
The palladium(0)-catalyzed condensation of aryl halides with the sodium salts of phenylsulfonylacetonitrile and diethyl cyanomethylphonate in dimethoxyethane gave the corresponding α-phenylsulfonylareneacetonitriles and diethyl arylcyanomethylphosphonates in good yields.The α-phenylsulfonylareneacetonitriles were easily desulfonylated with zinc to give the areneacetonitriles, and the arylcyanomethylphonates were converted to the alkylideneareneacetonitriles by means of the Horner-Emmons reaction.