Sulfuric Acid → HCID 21066948, compound

Participants

Reaction Conditions

Reaction Steps

4-{[3-Bromo-5-(2-chlorophenyl)pyrazolo[1,5-a]pyrimidin-7-ylamino]methyl}piperidine-1-carboxylic acid tert-butyl ester (441 mg, 0.847 mmoles) (prepared as described in Example 460, Step A above) was dissolved in methanol (4.5 mL) and 10% (v/v) conc. sulfuric acid in 1,4-dioxane (11.46 mL) was added. The mixture was stirred at 25° C. for 0.5h. The product was worked up as described in Preparative Example 241, step B and chromatographed on a silica gel column (15×5 cm) using 8% (10% conc. ammonium hydroxide in methanol)-dichloromethane as the eluant to give [3-bromo-5-(2-chlorophenyl)pyrazolo[1,5-a]pyrimidin-7-yl]piperidin-4-ylmethylamine (314.4 mg, 88%): FABMS: m/z 420.0 (MH+); HRFABMS: m/z 420.0585 (MH+). Calcd. for C18H20N5BrCl: m/z 420.0591; δH (CDCl3) 1.34 (2H, m, CH2), 1.86 (2H, m, CH2), 1.91 (1H, m, CH), 2.10 (1H, bm, piperidine-NH), 2.67 (2H, m, CH2), 3.18 (2H, m, CH2), 3.38 (2H, m, CH2), 6.37 (1H, s, H6), 6.53 (1H, m, NH), 7.42 (2H, m, Ar—H), 7.52 (1H, m, Ar—H), 7.76 (1H, m, Ar—H) and 8.06 ppm (1H, s Ar—H); δC (CDCl3) CH2: 31.2, 31.2, 46.2, 46.2, 48.4; CH: 36.4, 89.5, 127.1, 130.1, 130.5, 131.6, 143.8; C, 83.2, 132.1, 138.9, 145.6, 146.4, 158.1.

Provenance & Evidence