β-lithiations of carboxamides. Synthesis of β-substituted-α,β-unsaturated amides
作者:Alan R. Katritzky、Maria Szajda、Jamshed N. Lam
DOI:10.1002/jhet.5570300515
日期:1993.10
aldehydes and ketones affords monosubstituted products; with ethyl p-toluate, a lactam is formed. The alkylated derivatives eliminate benzotriazole in the presence of base to afford trisubstituted α,β-unsaturated amides.
N-甲基-2-甲基-3-(苯并三唑-1-基)丙酰胺在用丁基锂处理时形成二价阴离子,在用烷基和苄基卤化物,醛和酮处理时可得到单取代的产物。用乙酸乙酯p -toluate,形成内酰胺。烷基化的衍生物在碱存在下消除苯并三唑,得到三取代的α,β-不饱和酰胺。