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-acyltetramicacids (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.