A facile one-pot synthesis of 5-unsubstituted dihydropyrimidinones from β,γ-unsaturated ketoesters in low melting ʟ-(+)-tartaric acid–N,N-dimethylurea mixtures is reported. This solvent-free method is very general and provides easy access to 5-unsubstituted dihydropyrimidinone-4-carboxylate derivatives in good yields.
报道了一种简便的一锅法合成5-未取代二氢
嘧啶酮,其方法是从低熔点ʟ-(+)-
酒石酸-
N,
N-二甲基
脲混合物中的β,γ-不饱和
酮酯开始。这种无溶剂的方法非常通用,可轻松获得产率良好的5-未取代二氢
嘧啶酮-4-
羧酸酯衍
生物。