ANALOGIFREMGANGSMAATE VED FREMSTILLING AV NYE TERAPEUTISK AKTIVE ANGIOTENSIN-II-ANALOGER INNEHOLDENDE EN ALFA-HYDROXYCARBOXYLSYREREST I 8-STILLING

1. Claims for the contracting States : BE, CH, LI, DE, FR, GB, IT, NL, SE, Peptides having the general formula X-Arg-Val-Tyr-Ile-His-Pro-Y-O-A wherein X represents an acyl radical of a N-methyl-aminoacid or of an aliphatic carboxylic acid having in the alpha-position an aminooxy group or a hydroxyl group, each in the L-configuration in case of an asymmetrical carbon atom, Arg represents a radical of L-arginine, Val represents a radical of L-valine, Tyr represents a radical of L-tyrosine, Ile represents a radical of L-isoleucine, His represents a radical of L-histidine, Pro represents a radical of L-proline, Y represents a radical of an aliphatic alpha-hydroxycarboxylic acid having 1 lacking hydrogen atom of its hydroxyl group with respect of this acid beyond the absence of the hydroxyl group of the carboxylic group and A represents hydrogen or an alkyl radical having from 1 to 5 carbon atom(s), as well as their acid addition salts and pharmaceutically useful complexes. 1. Claims for the contracting state AT A process for the preparation of peptides having the general formula X-Arg-Val-Tyr-Ile-His-Pro-Y-O-A wherein X represents an acyl radical of a N-methyl-aminoacid or of an aliphatic carboxylic acid having in the alpha-position an aminooxy group or a hydroxyl group, each in the L-configuration in case of an asymmetrical carbon atom, Arg represents a radical of L-arginine, Val represents a radical of L-valine, Tyr represents a radical of L-tyrosine, Ile represents a radical of L-isoleucine, His represents a radical of L-histidine, Pro represents a radical of L-proline, Y represents a radical of an aliphatic alpha-hydroxycarboxylic acid having 1 lacking hydrogen atom of its hydroxyl group with respect of this acid beyond the absence of the hydroxyl group of the carboxylic group and A represents hydrogen or an alkyl radical having from 1 to 5 carbon atom(s), as well as of their acid addition salts and pharmaceutically useful complexes, characterized in that one condenses in a manner known per se in the peptide chemistry a propper aliphatic alpha-hydroxyl carboxylic acid or a propper alkyl ester of it having from 1 to 5 carbon atoms in the alkyl part or another ester of it only with a protective function of the ester group with the amino acid to be incorporated successively and having on its terminal nitrogen atom a splittable-off protective group and, as far as necessary, on another nitrogen atom being optionally present another splittable-off protective gro