| abstract |
The novel pseudo polypeptides of this invention are potent bombesin antagonists. There are provided processes for their production, pharmaceutical compositions comprising said polypeptides and their use as pharmaceutically active agents. More particularly the present invention provides pseudopeptides comprising a nonapeptide moiety of formula I: X-A1-A2-A3-A4-A5-A6-A7-A8-psi-A9-Q wherein Q is NH2 or OQ1 where Q1 is hydrogen, C1-10 alkyl, phenyl or phenyl-C7-10alkyl; X is hydrogen or a single bond linking to A2 the acyl residue of an organic acid, or a group of formula R1CO- wherein (1) R1 is hydrogen, C1-10 alkyl, phenyl or phenyl-C7-10-alkyl; (2) R1CO- is (a) R2N(R3)-CO- wherein R2 is hydrogen, C1-10alkyl, phenyl or C7-10phenyl-C7-10-alkyl, R3 is hydrogen or C1-10alkyl; (b) R4-O-CO- wherein R4 is C1-10alkyl, phenyl or phenyl-C7-10-alkyl. A1 is D-, L- or DL- pGlu,, Nal, Phe, Thl, Tyr, Tpi, Hca, Hpp, Mpp, Trp or Trp substituted in the benzene ring by one or more members selected from the group consisting of halogen, NO2, NH2, OH, C1-3 alkyl and C1-3 alkoxy wherein halogen is fluorine, chlorine and bromine; wherein A2-A7 and A9 are each amino acid residues; A8 is a reduced isostere of Leu or Phe. |