反应详情

Acetic acid (0.60 ml) and 3.5 ml of a 1 M tetra-n-butylammonium fluoride/THF solution are added to a solution of 491 mg of allyl(1R,5S,6S)-2-[(3S,5S)-1-allyloxycarbonyl-5-[1-hydroxy-1-(imidazo[5,1-b]thiazol-7-yl)methyl]pyrrolidin-3-yl]thio-6-[(1R)-1-(t-butyldimethylsilyloxy)ethyl]-1-methylcarbapen-2-em-3-carboxylate (a diastereomer mixture) in 10.5 ml of anhydrous THF, and the mixture is stirred in an argon atmosphere at room temperature for 16 hr. The reaction solution is diluted with 100 ml of ethyl acetate, and the diluted solution is successively washed with a 5% aqueous sodium hydrogencarbonate solution and saturated saline and dried over anhydrous magnesium sulfate, followed by filtration and the removal of the solvent by evaporation to give a dark yellow oil. This oil is purified by column chromatography on silica gel (ethyl acetate:methanol=95:5) to give 353 mg of allyl(1R,5S,6S)-2-[(3S,5S)-1-allyloxycarbonyl-5-[1-hydroxy-1-(imidazo[5,1-b]thiazol-7-yl)methyl]pyrrolidin-3-yl]thio-6-((1R)-1-hydroxyethyl)-1-methylcarbapen-2-em-3-carboxylate (a diastereomer mixture) as a light yellow amorphous material.

1. washthe diluted solution is successively washed with a 5% aqueous sodium hydrogencarbonate solution and saturated saline
2. dry with materialdried over anhydrous magnesium sulfate
3. filtrationfollowed by filtration
4. customthe removal of the solvent
5. customby evaporation
6. customto give a dark yellow oil
7. customThis oil is purified by column chromatography on silica gel (ethyl acetate:methanol=95:5)