Selectively S-Protected Cysteine Peptides. IV. Synthesis of Cysteine Peptides Using the S-Ethylthio Protecting Group. II
Studying the problems of the selective sulphur protection in cysteine peptides, a model octapeptide from the sheep insulin A-chain was prepared by conventional synthesis using the S-ethylthio and the S-diphenylmethyl group.As consequence of the small acid