发明授权
US4058521A 2-Halomethyl-2-nucleophilic substituted methyl penicillins 失效
2-卤甲基-2-亲核取代的甲基青霉素

2-Halomethyl-2-nucleophilic substituted methyl penicillins
摘要:
Antibacterial compounds of the formula ##STR1## (where COB is carboxy or protected carboxy;Hal is halogen;R is amino or protected amino;R' is mercapto-protecting group; andX is nucleophilic group)Are prepared from penicillin 1-oxides having X on its 2-methyl group, and found to be used as starting materials for preparing cephalosporins.
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