反应详情

To a solution of ethyl 6-((S)-1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-7-(4-(((R)-5-((tert-butyldiphenylsilyl)oxy)hexyl)oxy)-4-methylpiperidin-1-yl)-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylate (6.8 g, 8.34 mmol) in Ethanol (70 mL) was added 1N NaOH (9.18 mL, 9.18 mmol) and the resulting mixture was stirred at room temp for 5 h. Mixture was then concentrated and the residue was diluted with water (50 mL) acidified with 1N HCl and extracted with ether (200 mL), washed with brine (50 mL), dried (Na2SO4), filtered and concentrated to afford 6-((S)-1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-7-(4-(((R)-5-((tert-butyldiphenylsilyl)oxy)hexyl)oxy)-4-methylpiperidin-1-yl)-5-methylpyrazolo[1,5-a]pyrimidine-2-carboxylic acid (6.4 g, 8.13 mmol, 97% yield) as white solid. 1H NMR (500 MHz, CDCl3) δ 7.73-7.68 (m, 4H), 7.47-7.35 (m, 6H), 7.13 (s, 1H), 5.85 (br.s, 1H), 4.30-4.16 (m, 2H), 3.94-3.84 (m, 1H), 3.35 (q, J=6.3 Hz, 2H), 2.65 (s, 3H), 1.92 (d, J=10.7 Hz, 2H), 1.67-1.39 (m, 12H), 1.30 (s, 3H), 1.28-1.25 (m, 3H), 1.24 (s, 9H), 1.11-1.08 (m, 3H), 1.07 (s, 9H). LCMS (M+H)=787.4.

1. concentrationMixture was then concentrated
2. additionthe residue was diluted with water (50 mL)
3. extractionextracted with ether (200 mL)
4. washwashed with brine (50 mL)
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated