Abstract: Compounds of the formula (I) 1

Abstract: Compounds of formula (I) and their pharmaceutically acceptable salts inhibit matrix metalloproteases, such as stromelysin, gelatinase, matrilysin and collagenase, and are useful in the treatment of mammals having disease-states alleviated by the inhibition of such matrix metalloproteases.

Abstract: Compounds of formula (I) ##STR1## and their pharmaceutically acceptable salts inhibit matrix metalloproteases, such as stromelysin, gelatinase, matrilysin and collagenase, and are useful in the treatment of mammals having disease-states alleviated by the inhibition of such matrix metalloproteases.

Abstract: 2-Oxy-4H-3,1-benzoxazin-4-ones, useful as serine protease inhibitors, represented by the formula: ##STR1## and the pharmaceutically acceptable acid addition salts thereof, wherein:a is an integer of 1 to 4;A is a bond, or alkylene having one to eight carbon atoms;R is hydrogen, phenyl, imidazolyl or cycloalkyl having three to six carbon atoms, wherein the phenyl, imidazolyl or cycloalkyl ring is optionally substituted with 1 to 3 substituents independently selected from the group consisting of lower alkyl having one to four carbon atoms, lower alkoxy having one to four carbon atoms, --N(R.sup.1).sub.2, --NO.sub.2, halo or lower alkylthio having one to four carbon atoms, and,each R' is independently selected from the group consisting of hydroxy, benzyloxy, lower alkyl having one to six atoms, lower alkenyl having two to six carbon atoms, lower alkoxy having one to six carbon atoms, lower alkylthio or halo-lower alkyl having one to six carbon atoms, halo, --NO.sub.2, --N(R.sup.1).sub.2, --NR.sup.1 CO.sub.2 R.

Abstract: 2-Oxy-4H-3,1-benzoxazin-4-ones represented by the formula: ##STR1## and the pharmaceutically acceptable acid addition salts thereof, wherein: a is an integer of 0-4;A is a bond, or alkylene having one to eight carbon atoms;R is hydrogen, phenyl, imidazolyl or cycloalkyl having three to six carbon atoms, wherein the phenyl, imidazolyl or cycloalkyl ring is optionally substituted with 1-3 substituents independently selected from the group consisting of lower alkyl having one to four carbon atoms, lower alkoxy having one to four carbon atoms, --N(R.sup.1).sub.2, --NO.sub.2, halo or lower alkylthio having one to four carbon atoms, and,each R' is independently selected from the group consisting of lower alkyl having one to six atoms, lower alkenyl having two to six carbon atoms, lower alkoxy having one to six carbon atoms,lower alkylthio or halo-lower alkyl having one to four carbon atoms, halo, --NO.sub.2, --N(R.sup.1).sub.2, ##STR2## --NR.sup.1 COR.sup.2, and ##STR3## in which each R.sup.