title: Studies on peptides. LXXXI. Application of a new arginine derivative, NG-mesitylene-2-sulfonylarginine, to the synthesis of substance P and neurotensin.
abstract: A new devised arginine derivative, NG-mesitylene-2-sulfonylarginine, Arg(Mts), was employed for the synthesis of hypothalamic substance P and neurotensin. The former was obtained in 74% yield by treatment of the protected undecapeptide amide, Z - Arg(Mts) - Pro - Lys(Z) - Pro - Gln - Gln - Phe - Phe - Gly - Leu - Met(O)-NH2, with methanesulfonic acid in the presence of anisole followed by reduction of the sulfoxide with 2-mercaptoethanol. The latter was obtained in 54% yield by the similar treatment of the protected tridecapeptide ester, Z - Pyr - Leu - Tyr - Glu(OBzl) - Asn - Lys(Z) - Pro - Arg(Mts) - Arg(Mts) - Pro - Tyr - Ile - Leu - OBzl, with methanesulfonic acid. As scavenger, a mixture of anisole-thioanisole-o-cresol (1:1:1, by vol.) was employed to suppress the side reaction, O-mesitylene-2-sulfonation of the Tyr residue.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives*; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009496:Neurotensin / Q000138:chemical synthesis* / Q000494:pharmacology; D010446:Peptide Fragments; D011817:Rabbits; D013373:Substance P / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D010446:Peptide Fragments; D013373:Substance P; D009496:Neurotensin; D001120:Arginine