Vicentini CB, Veronese AC, Giori P, Baraldi PG, Guarneri M. Carboxyl activation in peptide synthesis using 4-oximino-pyrazol-5-ones.
INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1980;
16:48-54. [PMID:
7440062 DOI:
10.1111/j.1399-3011.1980.tb02933.x]
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Abstract
4-Oximino-pyrazol-5-ones 2a, b and their esters with N-protected amino acids 3a, b have been studied for carboxyl activation in peptide synthesis. 2a, b and 3a, b appear to be diastereoisomeric mixtures whose configurations have been assigned on the basis of spectroscopic and X-ray data. Some peptides obtained using these pyrazolone derivatives are reported: no racemization was noted by the Weigand test.
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