反应详情

A solution of 720 mg of 4-nitrobenzyl (1R,5S,6S)-2-[(2S,4S)-2-(4-methyl-1-piperazinylcarbonyl)-1-methyl-pyrrolidin-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 1.2 ml of 1N aqueous hydrochloric acid, and the mixture was hydrogenated by bubbling hydrogen through it at room temperature for 2 hours in the presence of 800 mg of 10% w/w palladium-on-charcoal. The catalyst was then removed by filtration and the filtrate was washed with diethyl ether. The aqueous solution was concentrated by evaporation under reduced pressure, the residue was subjected to column chromatography using a Lobar column (Merck, LiChroprep RP-8, size B) and the column was eluted with 3% by volume aqueous methanol. Those fractions containing the title compound were combined and concentrated by evaporation under reduced pressure, to give 326 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 800 mg of 10% w/w palladium-on-charcoal
2. customThe catalyst was then removed by filtration
3. washthe filtrate was washed with diethyl ether
4. concentrationThe aqueous solution was concentrated by evaporation under reduced pressure
5. washthe column was eluted with 3% by volume aqueous methanol
6. additionThose fractions containing the title compound
7. concentrationconcentrated by evaporation under reduced pressure