Application of acyl cyanophosphorane methodology to the synthesis of protease inhibitors: poststatin, eurystatin, phebestin, probestin and bestatin
作者:Harry H Wasserman、Anders K Petersen、Mingde Xia
DOI:10.1016/s0040-4020(03)00860-3
日期:2003.8
Full details are given for the syntheses of the proteaseinhibitors, poststatin and eurystatin by the acyl cyanophosphorane coupling procedure used for the formation of α-keto amides. We have also extended this methodology to the syntheses of the related α-hydroxy amide natural products, phebestin, probestin and bestatin. The key step in the latter synthetic sequences involved diastereomeric selectivity
Several pyrrolidine-containing analogues of poststatin were synthesized and examined for their inhibitory activity against prolyl endopeptidase and cathepsin B in vitro. Replacement of the postine residue with 2-oxo-2-(2-pyrrolidinyl)acetic acid increased the selectivity and inhibitory activity against prolyl endopeptidase. Benzyloxycarbonyl-L-phenylalanyl-(S)-2-oxo-2-(2-pyrrolidinyl)acetyl-D-phenylalanine was about 46 times as active to prolyl endopeptidase as natural poststatin.
A novel, biologically active substance, poststatin, has been isolated from a culture medium of microorganism belonging to Streptomyces. The novel substance is a peptide compound having a novel structure, wherein the peptide chains have ketone radicals. Thus substance has a high endopeptidase inhibition activity. It is possible to chemically synthesize poststatin related compound having ketone radicals in the peptide chains. These compounds also have an endopeptidase inhibition activity.
Total synthesis of poststatin was achieved by both liquid phase and solid phase methods. In both methods, the (2R, 3S)-3-amino-2-hydroxyvaleric acid moiety was incorporated into protected pentapeptides, and was oxidized to (S)-3-amino-2-oxovaleric acid (postine). Deprotection of the oxidized pentapeptides gave a specimen identical with natural poststatin in physico-chemical properties and prolyl endopeptidase inhibitory activity.
POSTOSTATIN AND RELATED COMPOUND THEREOF, OR THEIR SALTS
申请人:ZAIDAN HOJIN BISEIBUTSU KAGAKU KENKYU KAI
公开号:EP0423358A1
公开(公告)日:1991-04-24
Postostatin, a new physiologically active substance represented by (I), can be isolated from the culture medium of an actinomycete belonging to the genus Streptomyces. It is a peptide compound having a new structure wherein a keto group is present in the peptide chain and it has a potent endopeptidase inhibitory activity. A postostatin-related compound having a keto group in the peptide chain can he synthesized chemically and this compound has a similar endopeptidase inhibitory activity.