Preparation of azetidinones via novel protected intermediates
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United States of America Patent
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Oct 16, 1990
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app pub date -
Nov 28, 1988
filing date -
Mar 13, 1986
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Abstract
A multistep process is disclosed for preparing azetidinone intermediates used in the making penems and carbapenems wherein intermediates containing ##STR1## R' is independently hydrogen or 1, 2 or 3 of lower alkyl or lower alkoxy, preferably hydrogen, wherein R' is methyl, ethyl, a phenyl or alkyl, preferably ethyl, as a readily removable nitrogen protecting group are made.
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