Acetic Acid → HCID 17858109, compound

Participants

Reaction Steps

To a solution of 3-t-butyldiphenylsilyloxy-1-{4-[1-(p-nitrobenzyloxycarbonyl)-piperidin-4-ylcarbamoyl]-1,3-thiazol-2-yl}azetidine (570 mg, 0.820 mmol) (obtained as described in Reference Example 51(5)) in anhydrous tetrahydrofuran (17 ml) were added successively acetic acid (56 μl, 0.984 mmol) and a 1.0M solution of tetra-n-butylammonium fluoride in tetrahydrofuran (984 μl, 0.984 mmol) in an ice bath, and the mixture was stirred in the ice bath for 1 hour. After checking the completion of the reaction, the reaction mixture was partitioned between ethyl acetate and saturated aqueous sodium hydrogencarbonate solution. The organic layer was washed successively with a saturated aqueous sodium hydrogencarbonate solution and a saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (1:3)→ethyl acetate:methanol (95:5) as the eluant to afford 3-hydroxy-1-{4-[1-(p-nitrobenzyloxycarbonyl)-piperidin-4-ylcarbamoyl]-1,3-thiazol-2-yl}azetidine (360 mg, yield 95%) as a white solid.

Provenance & Evidence