A facilereductive amination procedure for electron-poor heterocyclic amines with aromatic and aliphatic aldehydes has been developed. The key to success was the use of triethylsilane (Et3SiH) as reducing agent, in combination with trifluoroacetic acid (TFA) in refluxing CH2Cl2. The reductive aminations are fast and clean, and allow for the isolation of the alkylated amines in highyields and purity
开发了一种简便的用芳香族和脂肪族醛对缺电子杂环胺进行还原胺化的方法。成功的关键是使用三乙基硅烷 (Et 3 SiH) 作为还原剂,并在回流 CH 2 Cl 2中与三氟乙酸 (TFA) 结合使用。还原胺化快速且干净,并允许在结晶或色谱纯化后以高产率和纯度分离烷基化胺。该工艺的稳健性和可扩展性已在 750 g 规模的一种底物组合中得到证明,从而以 93% 的收率分离出相应的产物。