expedient, eco-friendly and efficient procedure for the preparation of novel pyran derivatives has been developed through a solvent-free, one-pot reaction of various aldehydes, malononitrile and either methylacetoacetate or ethyl benzoylacetate in the presence of dibutylamine (2.5 mol %) at room temperature. This procedure is advantageous because it is mild, environmentally friendly, gives high yields and requires
通过在
二丁胺(2.5摩尔%)存在下,无溶剂,各种醛,
丙二腈和
乙酰乙酸甲酯或
苯甲酰乙酸乙酯的无溶剂一锅反应,开发了一种制备新型
吡喃衍
生物的简便,环保,高效的方法。在室温下。该方法是有利的,因为它温和,环保,产率高并且需要短的反应时间。此外,产物不需要通过萃取和柱色谱法分离。