Nucleophilic Addition of Ethyl 3-Bromodifluoromethyl-3-benzyloxyacrylate to Imines: An Effective Entry to Novel gem-Difluorinated Amino Esters and their Derivatives
Nucleophilic Addition of Ethyl 3-Bromodifluoromethyl-3-benzyloxyacrylate to Imines: An Effective Entry to Novel g<i>em</i>-Difluorinated Amino Esters and their Derivatives
作者:Shizheng Zhu、Weimin Peng、Jingwei Zhao、Ping He
DOI:10.1055/s-2006-926225
日期:——
Zinc- or tetrakis(dimethylamino)ethylene (TDAE)-mediated nucleophilic addition of ethyl 3-bromodifluoromethyl-3-benzyloxyacrylate to imines afforded gem-difluorovinyl substituted β-amino esters (α-addition product) and gem-difluorinated δ-amino esters (γ-addition product) or their cyclized derivatives, depending on the mediator and the nature of substituents on the imines.