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。