N-Boc-aminals as easily accessible precursors for less accessible N-Boc-imines: facile synthesis of optically active propargylamine derivatives using Mannich-type reactions
作者:Taiga Yurino、Yusuke Aota、Daisuke Asakawa、Taichi Kano、Keiji Maruoka
DOI:10.1016/j.tet.2016.03.076
日期:2016.6
We developed a facile and practical synthesis of N-Boc-aminals, which can be used as precursors for less accessible N-Boc-imines. Aminals were obtained via simple dehydration condensation reactions of t-butyl carbamate (BocNH2) and various aldehydes in acetic anhydride, followed by filtration and washing with hexane. The obtained N-Boc-alkynylaminals could be successfully applied in enantioselective
我们开发了一种简便实用的N -Boc-氨基缩醛合成方法,可以将其用作不太容易获得的N -Boc-亚胺的前体。通过简单的脱水缩合反应,得到缩醛胺吨丁基氨基甲酸酯(BocNH 2)和在乙酸酐各种醛,随后过滤并用己烷洗涤。所获得的N -Boc-炔基laminals可以成功地用于手性磷酸催化的对映选择性曼尼希型反应,从而提供光学活性的炔丙基胺衍生物。