A convenient and efficient synthesis of substituted dihydrofurans is developed via ring-enlargement of 1-dimethylaminopropenoyl-1-carbamoyl/benzoyl cyclopropanes catalyzed by ammonium acetate in acetic acid with high regio- and stereoselectivity. Some of the newly synthesized substituted dihydrofurans are subjected to further synthetic transformation in the presence of NaOH (aq) in ethanol to afford
通过
乙酸铵在
乙酸中催化的1-二甲基
氨基
丙烯酰基-1-
氨基甲酰基/苯甲酰基
环丙烷的环区域选择性高和立体选择性高的合成,开发了一种方便高效的取代二氢
呋喃合成方法。一些新合成的取代二氢
呋喃在
乙醇中的NaOH(
水溶液)存在下进行进一步的合成转化,得到相应的5-芳基-2,3-二氢
呋喃[3,2-c]吡啶-4(5H)-高产的。