4-Nitrobenzyl (1R,5S,6S)-2-[(2S,4S)-2-(3-dimethylaminoazetidin-1-ylcarbonyl)-1-(4-nitrobenzyloxycarbonyl)pyrrolidin-4-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylate → (1R,5S,6S)-2-[(2S,4S)-2-(3-Dimethylaminoazetidin-1-ylcarbonyl)pyrrolidin-4-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylic acid

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Reaction Steps

0.75 g of 4-nitrobenzyl (1R,5S,6S)-2-[(2S,4S)-2-(3-dimethylaminoazetidin-1-ylcarbonyl)-1-(4-nitrobenzyloxycarbonyl)pyrrolidin-4-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylate [prepared as described in Example 129(1)] was dissolved in a mixture of 21 ml of tetrahydrofuran and 14 ml of water, and 0.75 g of a 10% w/w palladium-on-carbon catalyst was added to the resulting solution, after which the mixture was hydrogenated at room temperature for 1.5 hours in an atmosphere of hydrogen. At the end of this time, the catalyst was removed by filtration and the filtrate was washed with diethyl ether. The resulting aqueous solution was then concentrated by evaporation under reduced pressure, after which the residue was subjected to reverse phase column chromatography (Cosmosil 75C18 -prep, 25 g, manufactured by Nacalai Tesque). Of the fractions obtained by elution with 7% by volume aqueous acetonitrile, the fraction containing the title compound was concentrated by evaporation under reduced pressure and freeze-dried, to obtain 171 mg of the title compound as a powder.

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