| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 4-nitrobenzyl(2S,4S,5R,6R)-3,3-dimethyl-7-oxo-6-phenoxyacetamido-1-aza-4-thiabicyclo<3.2.0>heptane-2-carboxylate 4-oxide | 41625-65-4 | C23H23N3O8S | 501.517 |
| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 6α-methoxy-6β-(2-phenoxy-acetylamino)-penicillanic acid 4-nitro-benzyl ester | 41625-73-4 | C24H25N3O8S | 515.544 |
| —— | p-nitrobenzyl (4R-acetylthio-3S-methoxy-3-phenoxyacetamido-2-azetidinon-1-yl)triphenylphosphoranylidene acetate | 84161-73-9 | C41H36N3O9PS | 777.791 |
| —— | N-p-nitrobenzoxalyl 4R-acetylthio-3S-methoxy-3-phenoxyacetamido-2-azetidinone | 117509-07-6 | C23H21N3O10S | 531.5 |
| —— | p-nitrobenzyl (4R-acetylthio-3S-methoxy-3-phenoxyacetamido-2-azetidinon-1-yl)chloro acetate | 117509-10-1 | C23H23N3O10S | 533.516 |
| —— | p-nitrobenzyl (5R) 6S-methoxy-2-methyl-6-phenoxyacetamidopenem-3-carboxylate | 84161-72-8 | C23H21N3O8S | 499.501 |
| —— | p-nitrobenzyl α-(4R-acetylthio-3S-methoxy-3-phenoxyacetamido-2-azetidinon-1-yl)-β-methylcrotonate | 117509-06-5 | C26H27N3O9S | 557.581 |
| —— | (6R)-7c-methoxy-3-methyl-8-oxo-7t-(2-phenoxy-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-nitro-benzyl ester | 41625-75-6 | C24H23N3O8S | 513.528 |
| —— | 2-((1S)-1-methoxy-7-oxo-3-phenoxymethyl-(1rH,5cH)-4-thia-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl)-3-methyl-but-2-enoic acid 4-nitro-benzyl ester | 41625-71-2 | C24H23N3O7S | 497.529 |
The preparation of 6α-methyl-2-methyl-6β-phenoxyacetamidopenem-3-carboxylate, 6α-methoxy-2-methyl-6β-phenoxyacetamidopenem-3-carboxylate, and 6α-methoxy-2-methyl-6β-phenylmalonylamidopenem-3-carboxylate from penicillin V and 6-aminopenicillanic acid is described. These penems have been isolated and characterized as their sodium or potassium salt. The chemical stability of the above compounds was determined as their half-life in aqueous buffer. In this way, it was found that the 6α-methyl analog was more stable than the parent 6-monosubstituted acylaminopenem while the remaining analogs were of comparable stability.