4-nitrobenzyl (1R, 5S, 6S)-2-[(2S, 4S)-2-[4-(N-4-nitrobenzyloxycarbonylacetimidoyl)piperazin-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-(4-Acetimidoylpiperazin-1-ylcarbonyl)pyrrolidin-4-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylic acid

Participants

Reaction Steps

5.10 g of 4-nitrobenzyl (1R, 5S, 6S)-2-{(2S, 4S)-2-[4-(N-4-nitrobenzyloxycarbonylacetimidoyl)piperazin-1-ylcarbonyl]-1-(4-nitrobenzyloxycarbonyl)pyrrolidin-4-ylthio}-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylate [prepared as described in step (a) above] were dissolved in 100 ml of a 6:4 by volume mixture of tetrahydrofuran and water, and the mixture was hydrogenated by bubbling hydrogen through it at room temperature for 2.5 hours in the presence of 5.0 g of 10% w/w palladium-on-charcoal. The catalyst was filtered off, and the filtrate was washed with diethyl ether and then concentrated by evaporation under reduced pressure. The resulting residue was purified by reverse phase column chromatography through 250 ml of Cosmo Sil 75C18 -PREP (a trade mark for a product of Nacalai Tesque), using water, 5% v/v aqueous acetonitrile and 7% v/v aqueous acetonitrile, in that order, as the eluent. Those fractions containing the title compound were combined, concentrated by evaporation under reduced pressure and lyophilized to give 940 mg of the title compound, as a powder.

Provenance & Evidence