.beta.-Lactam antibiotics with N-oxide side chains. 1. Quinoxaline N-oxides

.beta.-Lactam antibiotics with N-oxide side chains. 1. Quinoxaline N-oxides Quaternary heterocyclylamino .beta.-lactams: a generic alternative to the classical acylamino side chain Nitrones. 7. .alpha.-Quinoxalinyl-N-substituted nitrone 1,4-dioxides Studies on quinoline derivatives and related compounds. 5. Synthesis and antimicrobial activity of novel 1-alkoxy-1,4-dihydro-4-oxo-3-quinolinecarboxylic acids 2-Substituted Penems with Amino Acid-Related Side Chains: Synthesis and Antibacterial Activity of a New Series of .beta.-Lactam Antibiotics Synthesis and antibacterial activity of 7-(substituted)aminomethyl quinolones Synthesis and antimicrobial properties of substituted .beta.-aminoxypropionyl penicillins and cephalosporins Synthesis and .beta.-lactamase inhibitory properties of 2.beta.-[(acyloxy)methyl]-2.alpha.-methylpenam-3.alpha.-carboxylic acid 1,1-dioxides N-Azamonobactams. 2. Synthesis of some N-iminoacetic acid and N-glycyl analogs Structure-activity relationships of antibacterial 6,7- and 7,8-disubstituted 1-alkyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acids