A facile and efficient 1,4-addition of Me3SiCN to enones has been achieved with perfect regioselectivity using Cs2CO3 as catalyst. Thus, with 0.5 mol% of Cs2CO3 and 4 equivalents of H2O as the additive excellent yields (81-99%) of β-cyanoketones are obtained within one to five hours. Both aromatic and aliphatic enones are found suitable substrates for this protocol.
使用Cs2CO3作为催化剂,实现了Me3SiCN对烯酮的1,4-加成反应,具有完美的区域选择性,操作简便且效率高。因此,以0.5 mol%的Cs2CO3和4当量的
H2O作为添加剂,在一至五小时内得到了优异收率(81-99%)的β-
氰基酮。无论是芳香族还是脂肪族烯酮,均适用于这一反应体系。