Sodium Hydroxide → HCID 69592271, compound

Participants

Reaction Steps

To a solution of 350 mg (0.713 mmol) of (5Z)-7-{(1R,2S,3S,4S)-3-[5-(pyrrol-1-ylsulfonyl)thiophen-2-ylcarbonylamino]-bicyclo[2.2.1]hept-2-yl}-5-heptenoic acid methyl ester (I-1a) in 1 ml of methanol and 0.5 ml of tetrahydrofuran was added under ice-cooling 0.5 ml (2.0 mmol) of 4N sodium hydroxide. The mixture was warmed to room temperature and stirred at 25° C. for 2 h. The reaction mixture was diluted with water and washed with ether. The aqueous layer was acidified with 0.5 ml of 5N hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with water, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was recrystallized from ethyl acetate/hexane (3:4) to give 234 mg of (5Z)-7-{(1R,2S,3S,4S)-3-[5-(pyrrol-1-ylsulfonyl)-thiophen-2-ylcarbonylamino]-bicyclo[2.2.1]hept-2-yl}-5-heptenoic acid (I-1b) as needles.

Provenance & Evidence