Addition of lithium amides derived from a range of cyclic, sterically demanding, and chiral amines, to trifluoromethyl (Z)-enol ethers 1 and 4, provides stereoselectively the corresponding (Z)-enamines 3a–e and 7 in good yields. This reaction has been extended to the perfluoroalkyl and chlorofluoroalkyl enol ethers (CF2Cl, C2F5). The enamines can react with ButLi to give vinylic anions and, after quenching with aldehydes and ethyl chloroformate, provide new functionalized enamines 12–16.
将来自多种环状、体积庞大和手性胺的
锂胺与三
氟甲基(Z)-烯醇醚1和4反应,可选择性地生成相应的(Z)-烯胺3a–e和7,产率良好。该反应已扩展至
全氟烷基和
氯氟烷基烯醇醚(
CF2Cl,
C2F5)。烯胺可以与ButLi反应生成烯丙负离子,随后与醛和
氯乙酸乙酯反应,提供新的功能化烯胺12–16。