| 摘要 |
<p>A peptide represented by general formula (I) is cyclized to give a cyclic peptide, preferably a synthetic calcitonin derivative (elcatonin). In the formula, A and B form a peptide represented by the formula Ser-Asn-Leu-Ser-Thr and X is a hydroxyl group, a protective group for a carboxyl group, an amino acid residue or a peptide residue, provided that an amino acid or a peptide is condensed with the side chain carboxyl group of α-L-aminosuberic acid. The cyclic peptide is prepared by subjecting the peptide represented by general formula (I) to (1) a cyclization reaction through a chemical condensation, (2) a cyclization reaction in the presence of an alkali metal salt and (3) a reaction comprising a combination of a liquid-phase synthesis with a solid-phase synthesis.</p> |
