Optically active 4-carbalkoxy-2-azetidinones
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United States of America Patent
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Dec 29, 1987
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N/A
app pub date -
Oct 28, 1985
filing date -
Nov 2, 1984
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Expired
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Abstract
Novel 2-azetidinones of the formula ##STR1## wherein R is alkyl of 1 to 4 carbon atoms, R.sub.1 is selected from the group consisting of hydrogen, --OH, protected hydroxy and --OCH.sub.2 --COOR', R' is selected from the group consisting of hydrogen and alkyl of 1 to 4 carbon atoms and R.sub.2 is selected from the group consisting of alkyl of 1 to 4 carbon atoms and hydroxyl protective group and a novel process and novel intermediates for their preparation and a process for the preparation of compounds of the formula ##STR2## wherein R has the above definition, R'd is selected from the group consisting of hydrogen, --OH and protected hydroxyl and R.sub.3 is selected from the group consisting of hydrogen and R.sub.3 ', R.sub.3 ' is amino protective group which are useful intermediates.
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