摘要:
Reactions of alpha,beta -dehydrodipeptides containing a terminal gamma -aminobutyric acid residue with 3-ethoxycarbonylbenzotriazole I-oxide at 90-100 degreesC result mainly in cleavage of the peptide bond. In the cold, the corresponding ethyl ester and N-acyl-gamma -butyrolactam are formed. Analogous reactions with N-benzoyl- and N-benzyloxycarbonyl-gamma -aminobutyric acids leads to formation of the corresponding ethyl esters.