EP0542372A1 — 2-Substituted saccharin derivative proteolytic enzyme inhibitors

USPTO Abstract

Novel 2-substituted saccharins which inhibit the enzymatic activity of proteolytic enzymes are useful in the treatment of degenerative diseases and have the formula    wherein:    L is -O-, -S-, -SO- or -SO₂-;    m and n are each independently 0 or 1;    R₁ is substituted phenyl, heterocyclyl or substitued heterocyclyl or,    when L is -O- and n is 1, R₁ is cycloheptatrienon-2-yl or,    when L is -S- and n is 1, R₁ is cyano or lower-alkoxythiocarbonyl or,    when L is -SO₂- and n is 1, R₁ is lower-alkyl or trifluoromethyl;    R₂ is hydrogen, lower-alkoxycarbonyl, phenyl or phenylthio; and    R₃ and R₄ are each hydrogen or various substituents,    and processes for preparation and pharmaceutical compositions and method of use thereof are disclosed.