1 developed for peptide synthesis (2 in Scheme I). They are also intermediates in the preparation of N-thiocarboxy anhydrides 3 of a-amino acids (1, 3-thiazolidine-2, 5- dione~),~~,~) which were reported to have certain advantages for peptide synthe~ is~,~ by comparison to their oxygen analogues, N-carboxy anhydrides. Etc derivatives la and IC have also been explored for use as reversible amino protecting groups6 and in a scheme ...
[Saczewski, Franciszek; Gdaniec, Maria Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1992 , # 1 p. 47 - 50]