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US 4,539,152 AGranted
4-Substituted-2-oxoazetidine compounds
AssigneeFujisawa Pharmaceutical Co., Ltd.
InventorsMasashi Hashimoto, Matsuhiko Aratani, Kozo Sawada
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Abstract
The present invention relates to novel 4-substituted-2-oxoazetidine compounds and to processes for preparing the same. These compounds are useful intermediates for preparing antibiotics having the basic skeleton of Thienamycin.
Claims4
A carbapenam compound of the formula:
- ##STR180## wherein R.sub.h.sup.1 is 1-hydroxy-1-methylethyl or 1-hydroxy-1-methylethyl protected by a removable hydroxy protecting group and R.sup.8 is carboxy or carboxy protected by a removable carboxy protecting group and a pharmaceutically acceptable salt thereof.
Dependencies are inferred from the claim text.