Process for preparing 4-acetoxy-3-...

Details Process for preparing 4-acetoxy-3-... Process for preparing 4-acetoxy-3-...

C - Chemistry, Metallurgy

07

D

260/335.5

C07D 205/08 (2006.01) C07F 7/10 (2006.01) C07F 7/18 (2006.01)

Patent

CA 1256444

Abstract of the Disclosure A process for preparing a 4-acetoxy 3- hydroxyethylazetidin-2-one derivative having the formula (II): Image (II) wherein R1 is a protective group for the hydroxyl group, which comprises reacting a .beta.-lactam compound having the formula (I): Image (I) wherein R1 is as defined above, and R2, R3 and R4 are a lower alkyl group having 1 to 6 carbon atoms, phenyl group or an aralkyl group, with acetic anhydride in an organic solvent in the presence of a low concentration of a substituted pyridine. According to the present invention, there can be obtained 4-acetoxy-3-hydroxy- ethylazetidin-2-one derivatives, which are useful intermediates for preparing carbapenem .beta.-lactam antibiotics.

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