An expedient synthesis of 3-acyltetramic acids of the melophlin family from α-aminoesters and immobilized Ph3PCCO
作者:Rainer Schobert、Carsten Jagusch
DOI:10.1016/j.tet.2005.01.036
日期:2005.2
The naturally occurring 3-acyltetramic acids (3-acylpyrrolidine-2,4-diones) melophlin A, B, C and G were prepared in few steps from α-aminoesters or their hydrochlorides by cyclization with Ph3PCCO under mild conditions. The employment of immobilized, polystyrene-bound ylide greatly simplifies the removal of by-product Ph3PO and of other impurities. Various 3-acylation methods were assessed.
通过在温和条件下用Ph 3 PCCO环化,由α-氨基酯或其盐酸盐分几步制备天然存在的3-酰基四甲酸(3-酰基吡咯烷-2,4-二酮)melophlin A,B,C和G。固定化的,聚苯乙烯结合的内酯的使用大大简化了副产物Ph 3 PO和其他杂质的去除。评估了各种3-酰化方法。