One-Pot Synthesis of 1,2-Dihydropyridines: Expanding the Diverse Reactivity of Propargyl Vinyl Ethers
作者:Tobias Harschneck、Stefan F. Kirsch
DOI:10.1021/jo102545m
日期:2011.4.1
The catalyzed synthesis of 1,2-dihydropyridines starting from easily accessible propargyl vinyl ethers was realized. The reaction sequence involving a transition metal-catalyzed propargyl-Claisen rearrangement, a condensation step, and a Brønsted acid-catalyzed heterocyclization furnishes the highly substituted heterocycles in moderate to excellent yields. Additionally, a practical one-pot protocol
实现了从容易获得的炔丙基乙烯基醚开始的1,2-二氢吡啶的催化合成。涉及过渡金属催化的炔丙基-克莱森重排,缩合步骤和布朗斯台德酸催化的杂环化反应的反应顺序可提供中等至极高收率的高度取代的杂环。另外,开发了从炔丙基醇开始的针对1,2-二氢吡啶和2 H-吡喃的实用的一锅法。