Novel syntheses of the carbapenem key intermediates, (3R,4R)-4-acetoxy 3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone and (3S,4R)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-4-carboxymethyl-2- azetidinone, from (S)-ethyl lactate

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