Chiral β-Keto Propargylamine Synthesis via Enantioselective Mannich Reaction of Enamides with <i>C</i>-Alkynyl <i>N</i>-Boc <i>N</i>,<i>O</i>-Acetals
作者:Fang-Fang Feng、Shen Li、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acs.orglett.9b03181
日期:2019.10.18
Propargylamines are an important class of compounds in organic synthesis and drug discovery, yet the synthesis of chiral β-keto propargylamines remains underdeveloped. Herein, we describe a streamlined and general enantioselective Mannich reaction of enamides with C-alkynyl N-Boc N,O-acetals, which serve as readily available C-alkynyl imine precursors, to access a broad range of chiral β-keto N-Boc-propargylamines
炔丙胺是有机合成和药物开发中的重要一类化合物,但是手性β-酮炔丙胺的合成仍处于发展阶段。在本文中,我们描述了酰胺与C-炔基N -Boc N,O-乙缩醛的流线型和一般对映选择性曼尼希反应,可作为现成的C-炔基亚胺前体,以访问广泛的手性β-酮基N -Boc -炔丙基胺具有高产率(高达98%)和高对映选择性(高达95%ee)的单个立体生成中心。