Dichloromethane → 3-(1,1-dimethylethyl)-6-fluoro-1-methyl-9-(methyloxy)-5-{3-methyl-4-[(phenylmethyl)oxy]phenyl}-8-[(piperidin-4-ylmethyl)oxy]-3H-pyrazolo[3,4-c]isoquinoline

Participants

Reaction Steps

To 1,1-dimethylethyl 4-{[(3-(1,1-dimethylethyl)-6-fluoro-1-methyl-9-(methyloxy)-5-{3-methyl-4-[(phenylmethyl)oxy]phenyl}-3H-pyrazolo[3,4-c]isoquinolin-8-yl)oxy]methyl}piperidine-1-carboxylate (178 mg, 0.26 mmol) was added CH2Cl2 (3 mL). The solution was cooled with an ice bath and TFA (0.5 mL) was added slowly. After 1 h, the reaction mixture was diluted with CHCl3 and water was added. The mixture was then basified with 1 M KOH (aq) and partitioned. The organic layer was dried over magnesium sulfate, filtered and concentrated in vacuo to provide 3-(1,1-dimethylethyl)-6-fluoro-1-methyl-9-(methyloxy)-5-{3-methyl-4-[(phenylmethyl)oxy]phenyl}-8-[(piperidin-4-ylmethyl)oxy]-3H-pyrazolo[3,4-c]isoquinoline (159 mg, 0.26 mmol, 100% yield) as a yellow sticky solid. 1H NMR (400 MHz, CDCl3): δ 7.51-7.33 (m, 7H), 6.98 (d, 1H), 6.81 (d, 1H), 5.16 (s, 2H), 4.03 (d, 2H), 3.89 (s, 3H), 3.55 (d, 2H), 3.04-2.95 (m, 2H), 2.88 (s, 3H), 2.37 (s, 3H), 2.26 (m, 1H), 2.16 (d, 2H), 1.85 (s, 9H), 1.88-1.80 (m, 2H); MS (EI) for C36H41FN4O3: 597 (MH+).

Provenance & Evidence