DL-Phenylalanine, methyl ester → N-(Benzyloxycarbonyl)-L-aspartyl-L-phenylalanine methyl ester

Participants

Reaction Steps

The preparation of the immobilized enzyme and the reaction were conducted in the same manner as in Example 1 with the exception that: The quantity of Thermoase and that of the calcium acetate monohydrate were 9.0 g and 0.45 g respectively, the quantity of the 0.05 M sodium acetate buffer solution of pH 7.5 was 90 ml; the acrylic ester matrix carrier (Amberlite XAD-7, Trademark) was replaced with 16.6 g of another carrier of the similar class (Amberlite XAD-8, Trademark, containing about 150 wt.% of water on a dry basis; the quantity of N-benzyloxycarbonyl-L-aspartic acid was 2.14 g (8 m mol): L-phenylalanine methyl ester was replaced with 2.87 g (16 m mol) of DL-phenylalanine methyl ester; the quantity of the water saturated ethyl acetate solution was changed to 26 ml; and the reaction time was five fours. N-Benzyloxycarbonyl-L-aspartyl-L-phenylalanine methyl ester was obtained in the yield of 79.8%.

Provenance & Evidence