The present invention is based on the discovery that certain 3,4-disubstituted-azetidin-2-one derivatives exhibit excellent cysteine proteinase inhibitory activity which can be used for treatment of different diseases such as muscular dystrophy, myocardial infarction, bone resorption, arthritis, cancer metastasis, pulmonary emphysema, septic shock, cerebral ischemia, memory function, Alzheimer and cataract, malaria, glomerular basement membrane degradation, bacterial infection, inflammatory diseases, parasitic infections, and viral infections. In accordance to the present invention, there is provided a 3,4-disubstituted-azetidin-2-one derivatives of formula I, wherein R.sub.1, R.sub.2 and R.sub.3 are as defined herein, or a pharmaceutically acceptable salt thereof. ##STR1##

Synphar Laboratories, Inc.

3,4-Disubstituted azetidin-2-one derivatives useful as cysteine proteinase regulators

Disclosed herein are azetidin-2-one compounds which exhibit excellent cysteine proteinase inhibitory activity. The compounds are 4-substituted-3-{1 or 2 amino acid residue}-azetidin-2-ones of forumula I ##STR1## wherein AAR is a 1 or 2 acid residue, and R.sub.1 and R.sub.2 are as defined herein. The compounds can be used in the treatment of various diseases such as muscular dystrophy, bone resorption disorders, myocardial infarction and cancer metastasis.

4-substitued-3-[1 or 2 amino acid residue]-azetidin-2-one derivatives useful as cysteine proteinase inhibitor

In accordance with the present invention, there are provided 4-substituted-3-(2-amino-2-cycloalkyl methyl)-acetamido azetidin-2-one derivatives of the formula: ##STR1## wherein n is 1, 2 or 3; in which R.sub.1, R.sub.2 and R.sub.3 are as defined herein, and salts thereof, which exhibit excellent cysteine proteinase inhibitory activity and which can be used for treatment of different diseases such as muscular dystrophy, myocardial infarction, bone resorption, arthritis, cancer metastasis, pulmonary emphysema, septic shock, cerebral ischemia, memory function, Alzheimer and cataract, malaria, glomerular basement membrane degradation, bacterial infection, inflammatory diseases, parasitic infections, and viral infections.

proteinase/infark

3,4-Disubstituted azetidin-2-one derivatives useful as cysteine proteinase regulators

4-substitued-3-[1 or 2 amino acid residue]-azetidin-2-one derivatives useful as cysteine proteinase inhibitor

4-substituted-3-(2-amino-2-cycloalkyl methyl)-acetamido azetidin-2-one derivatives as cysteine proteinase regulators

4-substituted-3-(2-amino-2-cycloalkyl methyl)-acetamido azetidin-2-one derivatives as cysteine proteinase regulators

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