N-Fluorobis [(perfluoroalkyl)sulfonyl]imides. Efficient reagents for the fluorination of 1,3-dicarbonyl derivatives
作者:Ze-Qi Xu、Daryl D. DesMarteau、Yoshihiko Gotoh
DOI:10.1016/s0022-1139(00)82794-3
日期:1992.7
Fluorination of 1,3-dicarbonyl derivatives with N-fluorobis[(perfluoroalkyl)sulfonyl]imides, (CF3SO2)2NF (1), results in the formation of 2-fluoro- or 2,2-difluoro-1,3-(dicarbonyl analogs, depending on the reaction conditions. High yields are obtained for a variety of structural types. In the case of 1,3-dicarbonyl derivatives with low enol content, only the sodium enolates react with 1. Thus 1 has been demonstrated to be perhaps the best fluorinating reagent for the fluorination of 1,3-dicarbonyl derivatives. All of the 2-fluoro-1,3-dicarbonyl products exist predominantly as keto tautomers.