STUDY ON RACEMIZATION IN OXIDATION-REDUCTION CONDENSATION BY THE COUPLING REACTION FOR THE FORMATION OF BOC-LEU-ILE-ASP(NH2)-LEU-OBUt

Abstract
Racemization in the oxidation-reduction condensation was studied by the coupling reaction for the formation of Boc-Leu-Ile-Asp(NH2)-Leu-OBut , recently reported for the detection of racemization in the azide, dicyclohexylcarbodiimide +1-hydroxybenzotriazole methods, etc. The coupling reaction using triphenylphosphine and 2,2′-dithiodipyridine-1,1′-dioxide gave favorable results to the present racemization test on solid support as well as in solution synthesis.