Bromine → HCID 86697419, compound

Participants

Reaction Steps

Sodium acetate [127-09-3] (0.7 g, 8.9 mmol) was added to a solution of butyl-pyrazolo[1,5-a]pyrimidin-5-yl-amine (1.1 g, 5.9 mmol) in glacial acetic acid (100 mL) and allowed to stir at ambient temperature until all of the solid had dissolved. Bromine [7726-95-6] (0.3 mL, 6.4 mmol) was added drop by drop into the ambient temperature, buffered, acetic acid reaction solution over 5 minutes. Upon completion of the bromine addition, the suspension was allowed to stir for a further 15 minutes then was slowly poured into 500 mL of stirred water. Saturated aqueous sodium bicarbonate was added to the stirred suspension until pH of the supernatant was determined to be approximately 8 by pH paper, then the suspension was extracted with ethyl acetate. The extract was dried (MgSO4) and flash chromatographed (silica gel eluted with 60% (v/v) ethyl acetate/heptane) to provide 1.2 g of off white solid, mp. 94-95° C. 1H NMR (400 MHz, DMSO-d6) δ ppm 0.93 (t, J=7.33 Hz, 3 H) 1.31-1.44 (m, 2 H) 1.56 (quin, J=7.20 Hz, 2 H) 3.31-3.38 (m, 2 H) 6.28 (d, J=7.58 Hz, 1 H) 7.61 (t, J=5.05 Hz, 1 H) 7.85 (s, 1 H) 8.42 (d, J=7.58 Hz, 1 H). 13C NMR (100 MHz, DMSO-d6) δ ppm 13.67, 19.64, 30.53, 76.99, 100.87, 135.14, 143.03, 145.13, 156.09. LRMS (ESI) m/z 269.0/271.0 [(M+H)]+, calc'd for C10H13BrN4: 269.15.

Provenance & Evidence