ChemInform Abstract: Syntheses of Chiral Intermediates of 1-β-Methylcarbapenems: (3S,4R)-3-(1(R)-tert-butyldimethylsilyloxyethyl)-4-chloroazetidin-2-one and (3S,4S)-3-(1(R)-tert-butyldimethylsilyloxyethyl)-4-(1(R)-tert-butylthiocarbonylethyl)azetidin-2-on

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