Process for 3beta-aminoazetiden-2-ones

Details Process for 3beta-aminoazetiden-2-ones Process for 3beta-aminoazetiden-2-ones

C - Chemistry, Metallurgy

07

D

260/298.2

C07D 498/04 (2006.01) C07D 205/085 (2006.01)

Patent

CA 1105471

ABSTRACT OF THE DISCLOSURE The present invention provides a novel process fox preparing novel 7-oxo-3-phenyl-.alpha.-[4-(benzyloxy)phenyl]-4-oxa- 2,6-diazabicyclo[3.2.0]hept-2-ene-6-acetic acid esters of the formula Image I wherein R is C1-C3 alkyl, phenyl or benzyl; R1 is methyl, benzyl, 4-methoxybenzyl, or diphenyl- methyl; and R2 is benzyl, 4-methoxybenzyl, or diphenylmethyl; which comprises reacting in an inert solvent a 3-acylamino- 4.alpha.-acetoxyazetidinone ester of the formula Image III wherein R, R1, and R2 have the above-defined meanings, with hydrogen chloride. The novel compounds are useful inter- mediates in the preparation of the antibiotic FR 1923 (nocardicin).

298135

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