Felix AM, Wang CT, Liebman AA, Delaney CM, Mowles T, Burghardt BA, Charnecki AM, Meienhofer J. Synthesis, biological activity, and tritiation of L-3, 4-dehydroproline-containing peptides.
INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1977;
10:299-310. [PMID:
591179 DOI:
10.1111/j.1399-3011.1977.tb02801.x]
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Abstract
A series of analogs of thyroliberin (TRH) ([L-delta3Pro3]-TRH, [D-delta3Pro3]-TRH, [L-3-MeHis2, L-delta3Pro3]-TRH) in which proline was replaced by L- or D-3, 4-dehydroproline was synthesized. The analogs exhibited approximately the same biological activity as the corresponding proline-containing peptides. These analogs and others in which 3, 4-dehydroproline is present at the NH2-terminal, COOH-terminal or internal positions in the peptide were successfully reduced with deuterium or tritium to provide the 3, 4-2H2-proline or 3,4-3H2-proline analogs, respectively, with near theoretical values of substitution. A novel procedure for the chemical resolution of DL-3, 4-dehydroproline is also described.
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