title: Direct 6-methoxylation of penicillin derivatives. A convenient pathway to substituted  -lactam antibiotics.
mesh_terms: D000577:Amides; D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D007769:Lactams; D009682:Magnetic Resonance Spectroscopy; D008722:Methods; D008745:Methylation; D010406:Penicillins; D013329:Structure-Activity Relationship
chemical_list: D000577:Amides; D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D007769:Lactams; D010406:Penicillins