New enzymatic approach to the synthesis of convenient aspartic acid intermediates in peptide chemistry. Synthesis of n-benzyloxycarbonyl-l-aspartic acid β-allyl ester.
Aspartic acid side chain protection by allyl ester functions has been facilitated by the direct synthesis of Z-Asp(OA11)-OH which can be performed by selective hydrolysis of Z-Asp(OA11)-OA11 by means of papain catalysis. Both an optimization study and a batch synthesis are reported. Other synthetic routes are discussed.