Amino acids and peptides. XXVI. Phosphorus in organic synthesis. XV. Application of diphenyl phosphorazidate (DPPA) and diethyl phosphorocyanidate (DEPC) to the synthesis of the N-terminal decapeptide of gastric inhibitory polypeptide.

Abstract
The synthesis of the N-terminal decapeptide of gastric inhibitory polypeptide (GIP) [a gastrointestinal hormone], Tyr-Ala-Glu-Gly-Thr-Phe-Ile-Ser-Asp-Tyr was carried out in 2 ways (F1 + F2-4 + F5-10 and F1-4 + F5-10) using DPPA and DEPC as coupling reagents.