(4-nitrophenyl)methyl (4R,5S,6S)-6-[(1R)-1-hydroxyethyl]-4-methyl-3-[(3S,5S)-1-[(4-nitrophenyl)methoxycarbonyl]-5-[4-[N-[(4-nitrophenyl)methoxycarbonyl]carbamimidoyl]piperazine-1-carbonyl]pyrrolidin-3-yl]sulfanyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate → (1R,5S,6S)-2-[(2S,4S)-2-(4-Amidinopiperazin-1-yl-carbonyl)pyrrolidin-4-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylic acid

Participants

Reaction Steps

680 mg of 4-nitrobenzyl (1R,5S,6S)-6-[(1R)-1-hydroxyethyl]-1-methyl-2-[(2S,4S)-2-[4-(4-nitrobenzyl -oxycarbonylamidino)piperazin-1-ylcarbonyl]-1-(4-nitrobenzyloxycarbonyl)pyrrolidin-4-ylthio]-1-carbapen-2-em-3-carboxylate [prepared as described in step (1) above] were dissolved in 40 ml of a 1:1 by volume mixture of tetrahydrofuran and water, and 950 mg of a 10% w/w palladium-on-carbon catalyst were added to the resulting solution. The mixture was then hydrogenated in an atmosphere of hydrogen at 28° C. for 1 hour. At the end of this time, the catalyst was removed by filtration, and the filtrate was washed with diethyl ether. The aqueous layer was then concentrated by evaporation under reduced pressure, to 10 ml. The resulting solution was subjected to reverse phase silica gel column chromatography (Cosmosil 75C18 -prep, manufactured by Nacalai Tesque, 30 ml), eluted with mixtures of acetonitrile and water in proportions of 0:100, 2:98, 4:96 and 6:94, in that order. The fractions containing the desired compound were collected, concentrated by evaporation under reduced pressure, and freeze-dried to obtain 211 mg of the title compound as a powder.

Provenance & Evidence