Hydroxamic acid derivatives as collagenase inhibitors.

摘要

The invention provides hydroxamic acid derivatives of the formula <CHEM> wherein R<1> represents a 5- or 6-membered N-heterocyclic ring, R<2> and R<3> each represent lower alkyl or NR<2>R<3> represents a saturated 5-, 6- or 7-membered heterocyclic ring, R<4>, R<5>, R<6> and R<7> each represent hydrogen or methyl, provided that at least two of these symbols represent hydrogen and n stands for 1-4, and their pharmaceutically acceptable salts, which are collagenase inhibitors useful for the control or prevention of degenerative joint diseases such as rheumatoid arthritis and osteoarthritis or for the treatment of invasive tumours, atherosclerosis or multiple sclerosis.