Intermediate of carbapenem antibiotics and process for the preparation thereof

   
   

There is disclosed an azetidinone compound of the formula (I): ##STR1## wherein R is hydrogen, or a hydroxy protecting group, R.sub.1 and R.sub.2 are each independently alkyl of 1-15 carbon atoms, benzyl or cyclized together with the carbon atom to which they are attached to form a 5 or 6-membered cyclic hydrocarbon or a heterocyclic radical having one or two hetero ring atoms, said hetero ring atoms being selected from the group consisting of O and S; R.sub.3 is lower alkyl or --COO(lower alkyl) R.sub.4 is phenyl, or phenyl substituted with halogen, lower alkoxy or nitro which is useful as a synthetic intermediate to the 1'.beta.-methylcarbapenem-type antibacterial agent.

 
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