Brønsted Acid-Thiourea Co-catalysis: Asymmetric Synthesis of Functionalized 1,4-Dihydropyridines from β-Enamino Esters and α,β-Unsaturated Aldehydes
作者:Yoshiji Takemoto、Kohzo Yoshida、Tsubasa Inokuma、Kiyosei Takasu
DOI:10.1055/s-0030-1258090
日期:2010.7
A Bronsted acid and a novel thiourea derivative co-catalyze the addition of β-enamino esters to a,β-unsaturated aldehydes leading to functionalized 1,4-dihydropyridines with moderate to good enantioselectivity. A regioselective synthesis of 1,2-dihydropyridines from a,β-unsaturated aldehydes is also described.
布朗斯台德酸和新型硫脲衍生物共催化 β-烯氨基酯与 α,β-不饱和醛的加成,从而产生具有中等至良好对映选择性的官能化 1,4-二氢吡啶。还描述了从 a,β-不饱和醛区域选择性合成 1,2-二氢吡啶。