反应详情

One example of method (ii) is described in U.S. Pat. No. 3,933,781. N-formyl-α-L-aspartyl-L-phenylalanine (hereinafter referred to as "F-α-AP") is formed by condensing N-formyl-L-aspartic acid anhydride and L-Phe in glacial acetic acid, followed by removal of the formyl group from the product to form α-L-aspartyl-L-phenylanine (hereinafter referred to as "α-AP"), isolation of the α-AP intermediate and finally esterification of the isolated intermediate to obtain α-APM.HCl. As with the other previously described method, this method also suffers the disadvantaqe of requiring isolation of an intermediate compound.