Silica-supported tetramethylguanidine catalyst was prepared and effectively used in the aldol-type coupling of aldehydes with ethyl diazoacetate to afford the corresponding α-diazo-β-hydroxy esters in good to excellent yields. The catalyst was quantitatively recovered from the reaction by a simple filtration and reused for a number of cycles with almost consistent activity.
silica 支持的
四甲基胍催化剂被制备并有效用于醛与乙基二氮
乙酸酯的 aldol 型耦合反应,得到相应的 α-二氮-β-羟基酯,产率良好至优秀。该催化剂通过简单过滤方法从反应中定量回收,并在多个循环中重复使用,几乎保持一致的活性。