Decarboxyclavulanic acid thio ethers, their preparation and use
申请人:Beecham Group Limited
公开号:US04275067A1
公开(公告)日:1981-06-23
Compounds of the formula (II): ##STR1## wherein X is S, SO or SO.sub.2 ; and R is (a) an alkyl group of up to 4 carbon atoms, (b) an alkyl group of up to 4 carbon atoms substituted by an OR.sup.1, NHR.sup.1, NH.CO.R.sup.1 or CO.sub.2 R.sup.2 group wherein R.sup.1 is a hydrogen atoms, an alkyl group of up to 4 carbon atoms or benzyl group, and R.sup.2 is a moiety such that CO.sub.2 R.sup.2 is a carboxyl, salted carboxyl or esterified carboxyl group, (c) an aryl group or (d) an aralkyl group are useful for their anti-fungal and .beta.-lactamase inhibitory properties.
Dehydrative decarboxylation of clavulanic acid. A ready synthesis of 7-oxo-3-vinyl-4-oxa-1-azabicyclo[3.2.0]hept-2-ene
作者:Eric Hunt
DOI:10.1039/c39790000686
日期:——
Clavulanicacid (1) is converted by an efficient one-step process into the conjugated diene (3), which has been used in the preparation of novel analogues of (1), such as (4), (6), and (7).
The compounds of the formula (I): ##STR1## wherein X represents a moiety of the sub-formula (a) or (b): ##STR2## HAVE BEEN FOUND TO BE .beta.-LACTAMASE INHIBITORS WHICH MAY BE USED IN PHARMACEUTICAL COMPOSITIONS TO ENHANCE THE EFFECTIVENESS OF PENICILLINS OR CEPHALOSPORINS. The diene of the formula (I) may be produced by the decarboxylation of clavulanic acid or a derivative thereof and the monoene of the formula (I) may be produced by the 1,4 addition of hydrogen to the diene of the formula (I). The diene is thus also useful as a chemical intermediate and other such uses are demonstrated.
Compounds of the formula (II): ##STR1## wherein R.sub.1 is hydrogen or alkyl of 1 to 4 carbon atoms, CO.sub.2 R.sub.2 is a carboxyl group, a pharmaceutically acceptable salt thereof or a pharmaceutically acceptable esterified carboxyl group, are useful for their .beta.-lactamase inhibitory activity and to synergize the antibacterial activity of penicillins and cephalosporin.