Ring-closure method for 1-carbacephalosporin six-membered ring
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United States of America Patent
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Feb 18, 1992
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app pub date -
Apr 25, 1991
filing date -
Apr 25, 1991
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Abstract
The invention provides a process for preparing 7-protected amino-4-protected carboxy-1-carbacephalosporins which includes subjecting a 3-protected-amino-4-(1-propylene oxide)-methyl(protected carboxy)-azetidin-2-one to a strong base to form a 2-hydroxycepham and thereafter dehydrating the 2-hydroxycepham to form the desired 1-carbacephalosporin.
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