4-nitrobenzyl 2-diazo-4-[(2R,3S)-3-{1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl}-4-oxoazetidin-2-yl]-3-oxobutanoate → 4-nitrobenzyl(2R,5R,6S)-3,7-dioxo-6-[1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl]-1-azabicyclo[3.2.0]heptane-2-carboxylate

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A mixture of 4-nitrobenzyl 2-diazo-4-[(2R,3S)-3-{1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl}-4-oxoazetidin-2-yl]-3-oxobutanoate (58.0 mg) and rhodium (II) acetate (0.1 mg) in benzene (3.4 ml) was refluxed for 30 minutes. After cooling to ambient temperature, the mixture was filtered with a diatomaceous earth and evaporated to give 4-nitrobenzyl (2R,5R,6S)-3,7-dioxo-6-[1-methyl-1-(4-nitrobenzyloxycarbonyloxy)ethyl]-1-azabicyclo[3.2.0]-heptane-2-carboxylate (47.8 mg) as an amorphous solid.

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