反应详情

To a solution of (S,E)-ethyl 6-(1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-5-methyl-7-(4-methylpent-1-en-1-yl)pyrazolo[1,5-a]pyrimidine-2-carboxylate (190 mg, 0.426 mmol) in EtOH (4 mL) was added 1N NaOH (0.426 mL, 0.426 mmol) and the resulting mixture was stirred at room temp for 4 h. At this point LCMS indicated completion of reaction. Solvents were then removed under reduced pressure and the mixture was diluted with water (3 mL), acidified with 1N HCl, extracted with ethyl acetate (25 mL), washed with brine (10 mL), dried (Na2SO4), filtered and concentrated to afford (S,E)-6-(1-(tert-butoxy)-2-ethoxy-2-oxoethyl)-5-methyl-7-(4-methylpent-1-en-1-yl)pyrazolo[1,5-a]pyrimidine-2-carboxylic acid (145 mg, 0.347 mmol, 81% yield) as light yellow solid. 1H NMR (500 MHz, CDCl3) δ 7.20 (s, 1H), 7.01 (d, J=16.1 Hz, 1H), 6.90 (br. s., 1H), 5.57 (s, 1H), 4.48 (d, J=7.3 Hz, 1H), 4.30-4.22 (m, 2H), 2.72 (br. s., 3H), 2.00-1.85 (m, 1H), 1.32-1.25 (m, 3H), 1.18 (s, 9H), 1.10-0.97 (m, 6H). LCMS (M+H)=418.4.

1. customcompletion of reaction
2. customSolvents were then removed under reduced pressure
3. additionthe mixture was diluted with water (3 mL)
4. extractionextracted with ethyl acetate (25 mL)
5. washwashed with brine (10 mL)
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated