An efficient and novel synthesis of chromonyl chalcones using recyclable Zn(l-proline)2 catalyst in water
作者:Zeba N. Siddiqui、T.N. Mohammed Musthafa
DOI:10.1016/j.tetlet.2011.05.118
日期:2011.8
A novel approach was adopted for the synthesis of a series of chromonyl chalcones (3a–o) from 3-formylchromones (1a–c) and different cyclic active methyl compounds (2a–e), employing Zn(l-proline)2 as a recyclable Lewis acid catalyst in water. In each conversion, the catalyst was successfully recovered and reused several times without significant loss in yield and selectivity. All the newly synthesized
采用了一种新颖的方法,以Zn(l-脯氨酸)2为原料,由3-甲酰基色酮(1a – c)和不同的环状活性甲基化合物(2a – e)合成了一系列的羰基查耳酮(3a – o)。在水中可循环使用的路易斯酸催化剂。在每次转化中,催化剂被成功回收并重复使用了几次,而收率和选择性没有明显损失。使用元素分析和光谱数据(IR,1 H NMR,13 C NMR和质谱)对所有新合成的化合物进行表征。