Ono Pharmaceutical Co., Ltd.

Kissei Pharmaceutical Co., Ltd.

Masaki Havashi

Masanori Kawamura

Tadao Tanouchi

The pyridine derivatives of the general formula: ##STR1## [wherein A represents an alkylene group containing from 1 to 5 carbon atoms unsubstituted or substituted by a hydroxy group, B represents a single bond, or an oxygen or sulphur atom, or an alkylene group containing from 1 to 5 carbon atoms, D represents a single bond, or an alkylene group containing from 1 to 5 carbon atoms, E represents a grouping of the formula: ##STR2## (in which R.sup.6 represents a hydrogen atoms, or an alkyl group containing from 1 to 4 carbon atoms), Z represents a single bond, or an ethynylene group, or a grouping of the formula: ##STR3## in which R.sup.2 represents a hydrogen atom, or an alkyl group containing from 1 to 4 carbon atoms, R.sup.3 represents a hydrogen, bromine or chlorine atom, or an alkyl group containing from 1 to 4 carbon atoms, the symbol  represents a single or double bond, the carbon atom attached to R.sup.2 binds to B, and the carbon atom attached to R.sup.3 binds to D, R.sup.1 represents a hydroxy group, or a grouping of the formula: --COOR.sup.4 or --COSR.sup.4, in which R.sup.4 represents a hydrogen atom, or an alkyl group containing from 1 to 12 carbon atoms, or an aralkyl group containing from 7 to 13 carbon atoms, or a cycloalkyl group containing from 4 to 7 carbon atoms unsubstituted or substituted by at least one alkyl group containing from 1 to 4 carbon atoms, or a phenyl group unsubstituted or substituted by at least one halogen atom, trifluoromethyl group, alkyl or alkoxy or alkylthio group containing from 1 to 4 carbon atoms, nitro or phenyl group, R.sup.5 represents a hydrogen atom, or an alkyl group containing from 1 to 4 carbon atoms, with the proviso that, when B represents an oxygen or sulphur atom, Z represents a single bond and D represents an alkylene group containing from 1 to 5 carbon atoms], and non-toxic acid addition salts thereof and, when R.sup.1 represents a carboxy or thiocarboxy group, non-toxic salts thereof, possess a strong inhibitory activity on thromboxane synthetase from rabbit platelet microsomes, and are useful as therapeutically active agents for the treatment or prevention of inflammation, hypertension, thrombus, cerebral apoplexy, asthma, myocardial infarction, cardiostenosis, and cerebral infarction.

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Takatsuki, Japan

Masaki Havashi