反应详情

A solution of 700 mg of 4-nitrobenzyl (1R,5S,6S)-2-{(2S,4S)-2-[4-(2-hydroxyethyl)-1-piperazinylcarbonyl]-1-methylpyrrolidin-4-ylthio}-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carbapen-2-em-3-carboxylate [prepared as described in step (a) above] in 60 ml of a 1:1 by volume mixture of tetrahydrofuran and water was mixed with 1.15 ml of 1N aqueous hydrochloric acid, and the mixture was hydrogented by bubbling hydrogen through it at room temperature for 2 hours in the presence of 1000 mg of 10% w/w palladium-on-charcoal. At the end of this time, the catalyst was removed by filtration, and the filtrate was extracted with diethyl ether. The remaining aqueous layer was concentrated by evaporation under reduced pressure, and the residue was subjected to column chromatography through a Lobar column (Merck, LiChroprep RP-8, size B). The column was eluted with 1.5% v/v aqueous methanol and those fractions containing the title compound were combined, concentrated by evaporation under reduced pressure and lyophilized, to give 300 mg of the title compound as a colorless powder.

1. customby bubbling hydrogen through it at room temperature for 2 hours in the presence of 1000 mg of 10% w/w palladium-on-charcoal
2. customAt the end of this time, the catalyst was removed by filtration
3. extractionthe filtrate was extracted with diethyl ether
4. concentrationThe remaining aqueous layer was concentrated by evaporation under reduced pressure
5. washThe column was eluted with 1.5% v/v aqueous methanol
6. additionthose fractions containing the title compound
7. concentrationconcentrated by evaporation under reduced pressure