4-Chloroazetidinone-1-(2',3'-dichloroisopropyl) acetates and process for preparing same

Abstract

The invention relates to novel azetidinones of the general formula: ##STR1## wherein R stands for lower alkyl, phenyl, phenyloxyloweralkyl, phenylloweralkyl, 2-thiophenemethyl, 5-tetrazolylmethyl, R.sup.3 O--and R.sup.3 S--, wherein R.sup.3 stands for lower alkyl, phenyl or phenylloweralkyl; R.sup.1 is hydrogen or a cleavable radical selected from lower alkyl; loweralkoxymethyl, 2,2,2-trichloroethyl, benzyl, p-halobenzyl, p-nitrobenzyl and p-methoxybenzyl, benzhydryl and trimethylsilyl; R.sup.2 is hydrogen or methoxy; X is SCl, Sbr or --OH in which case the C.sub.3 -sidechain is better represented as the amide RCONH-- group; Y is chloro or bromo; and ##STR2## may also be taken as phthalimido. These novel compounds possess antibacterial activity and are useful intermediates for the synthesis of modified penicillins and the analogues of penicillins.

Dependencies are inferred from the claim text.