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The synthesis and antibacterial activity of 6 alpha-methoxysulbenicillin analogues (2) are described. Structure-activity studies of these derivatives bearing hydrophilic substituents in the phenyl ring led to the identification of disodium 6 beta-[D-2-(3,4-dihydroxyphenyl)-2-sulfoacetamido]-6 alpha-methoxypenicillanate (2m) as a compound with potent activity against Pseudomonas aeruginosa including beta-lactamase producing strains. Additional substitution of 2m gave derivatives 2p, 2q, 2r, with a further improvement in activity against Gram-negative bacteria.

journal of antibiotics

Studies on 6.ALPHA.-substituted penicillins. II Synthesis and structure-activity relationships of 6.BETA.-(2-aryl-2-sulfoacetamido)-6.ALPHA.-methoxy penicillanic acids.