反应详情

To a solution of 4-(4-aminophenyl)isoindolin-1-one (0.327 g, 1.46 mmol, made according to literature procedures) in EtOAc (5 mL) was added NaOH (2N, 2 mL, 4 mmol) and Troc-Cl (0.618 g, 2.92 mmol) and the resulting mixture was stirred at RT for 6 h. Water (20 mL) was added and the mixture was extracted with EtOAc (3×20 mL), dried (MgSO4) and concentrated. The residue was dissolved in DMF (2 mL) to which was added 5-amino-3-t-butylpyrazole (0.831 g, 5.97 mmol, made according to literature procedures) and i-Pr2NEt (0.406 g, 2.92 mmol) and the solution was stirred at 90° C. overnight. Water (100 mL) was added and the mixture was extracted with EtOAc (3×100 mL), dried (MgSO4) and concentrated. Addition of CH2Cl2 to the residue resulted in precipitation of the product. The product was collected and dried to yield 1-(3-t-butyl-1H-pyrazol-5-yl)-3-(4-(1-oxoisoindolin-4-yl)phenyl)urea (270 mg, 48% yield) as a light brown powder. 1H-NMR (DMSO-d6): δ 9.31 (s, br, 1H), 8.95 (s, br, 1H), 8.65 (s, br, 1H), 7.65-7.63 (m, 2H), 7.58-7.52 (m, 5H), 6.00 (s, br, 1H), 4.51 (s, 2H), 1.25 (s, 9H), one NH is not visible. MS expected 390.2 found 390.2.

1. extractionthe mixture was extracted with EtOAc (3×20 mL)
2. dry with materialdried (MgSO4)
3. concentrationconcentrated
4. dissolutionThe residue was dissolved in DMF (2 mL) to which
5. stirringthe solution was stirred at 90° C. overnight
6. extractionthe mixture was extracted with EtOAc (3×100 mL)
7. dry with materialdried (MgSO4)
8. concentrationconcentrated
9. additionAddition of CH2Cl2 to the residue
10. customresulted in precipitation of the product
11. customThe product was collected
12. customdried