A Novel, One-Pot Reductive Alkylation of Amines by <i>S</i>-Ethyl Thioesters Mediated by Triethylsilane and Sodium Triacetoxyborohydride in the Presence of Palladium on Carbon
作者:Yinglin Han、Michael Chorev
DOI:10.1021/jo982125g
日期:1999.3.1
The reductive alkylation of primary amines with aldehydes or ketones is an important tool in the synthesis of wide variety of amines. We described here a novel, one-pot reductive alkylation method using multifunctional S-ethyl thioesters as a source for in situ generation of aldehydes to alkylate a range of multifunctional primary amines. The corresponding multifunctional secondary amines were obtained
伯胺与醛或酮的还原性烷基化反应是合成多种胺的重要工具。我们在这里描述了一种新颖的一锅还原烷基化方法,该方法使用多功能S-乙基硫酯作为原位生成醛以烷基化一系列多功能伯胺的来源。以良好至优异的产率(大部分> 90%)获得相应的多官能仲胺。该一锅还原烷基化包括在低于20摄氏度的温度下用三乙基硅烷处理受保护的S-乙基硫酯,伯胺,10%Pd / C和三乙酰氧基硼氢化钠在N,N-二甲基甲酰胺中的混合物30分钟。当醛不够稳定以至于不能分离时,该方法具有特殊的优点,因此不适合逐步还原烷基化的策略。1(S)-[((9-芴基甲氧基羰基)氨基] -4-氧代丁酸叔丁基酯(10)就是这种情况,它不能从α-叔丁基γ-S-乙基(S)-N获得-(9-芴基甲氧基羰基)硫代谷氨酸盐(9)。但是,通过我们的一锅还原烷基化方法,用9处理9-芴甲基苯丙氨酸酯(6a)得到了叔丁基2(S)-[(9-芴基甲氧基羰基)氨基] -4-[[3-苯基-1(