A process is described for reacting a vinylogous amide with an &agr;,&bgr;-unsaturated ketone in the presence of a silicon compound to form an 1,5-diketone which is converted to a 1,4-dihydropyridine. Asymmetric substituted 1,4-dihydropyridines are synthesized by the process by preparing an asymmetric vinylogous amide by reacting a 1,3-cyclohexanedione with a substantially homo-chiral phenylethylamine. Reaction of the asymmetric vinylogous amide with an &agr;,&bgr;-unsaturated ketone in the presence of a silicon compound forms an asymmetric 1,5-diketone. The 1,5-diketone is converted to an asymmetric substituted 1,4-dihydropyridine.
该过程描述了在
硅化合物存在下,将一种vinyl羰胺与一种α,β-不饱和酮反应生成1,5-二酮,该化合物转化为1,4-
二氢吡啶。通过将
1,3-环己二酮与基本上同构手性苯
乙胺反应以制备不对称的vinyl羰胺,通过在
硅化合物存在下将不对称的vinyl羰胺与α,β-不饱和酮反应形成不对称的1,5-二酮。该1,5-二酮转化为不对称取代的1,4-
二氢吡啶,从而合成了不对称取代的1,4-
二氢吡啶。