Amidinate Salt of Hexafluoroacetone Hydrate for the Preparation of Fluorinated Compounds by the Release of Trifluoroacetate
作者:Mark V. Riofski、Allison D. Hart、David A. Colby
DOI:10.1021/ol303291x
日期:2013.1.4
A powerful, new reagent, an amidinate salt of hexafluoroacetone hydrate, is an air-stable salt that can be used for the preparation of fluorinated organic molecules. Nucleophilic trifluoromethylation reactions are demonstrated following the base-promoted release of trifluoroacetate. This reagent is soluble in many polar organic solvents and produces fluoroform, following the release of trifluoroacetate
Double agent: The direct α‐difluoromethylation of lithiumenolates using an umpolung form of fluoroform as a difluoromethyl carbocation equivalent leads to an all‐carbon quaternary center. Late transition metals are not necessary and the reaction involves activation of inert CF bonds with subsequent CCbond formation.