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Optimization of peptidyl allyl sulfones as clan CA cysteine protease inhibitors.

Abstract：

:This research investigates the synthesis and inhibitory potency of a series of novel dipeptidyl allyl sulfones as clan CA cysteine protease inhibitors. The structure of the inhibitors consists of a R(1)-Phe-R(2)-AS-Ph scaffold (AS = allyl sulfone). R(1) was varied with benzyloxycarbonyl, morpholinocarbonyl, or N-methylpiperazinocarbonyl substituents. R(2) was varied with either Phe of Hfe residues. Synthesis involved preparation of vinyl sulfone analogues followed by isomerization to allyl sulfones using n-butyl lithium and t-butyl hydroperoxide. Sterics, temperature and base strength were all factors that affected the formation and stereochemistry of the allyl sulfone moiety. The inhibitors were assayed with three clan CA cysteine proteases (cruzain, cathepsin B and calpain I) as well as one serine protease (trypsin). The most potent inhibitor, (E)-Mu-Phe-Hfe-AS-Ph, displayed at least 10-fold selectivity for cruzain over clan CA cysteine proteases cathepsin B and calpain I with a (kobs)/[I] of 6080 ± 1390 M(-1)s(-1).

journal_name

J Enzyme Inhib Med Chem

journal_title

Journal of enzyme inhibition and medicinal chemistry

authors

Fennell BD,Warren JM,Chung KK,Main HL,Arend AB,Tochowicz A,Götz MG

doi

10.3109/14756366.2011.651466

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

468-78

issue

3

eissn

1475-6366

issn

1475-6374

journal_volume

28

pub_type

杂志文章

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