Hydrochloric Acid → HCID 22617857, compound

Participants

Reaction Steps

To a stirred solution of N-[3-(2,6-dichloro-4-methoxy-phenyl)-2,5-dimethyl-pyrazolo[1,5-a]pyrimidin-7-yl]-ethane-1,2-diamine (3.32 g, 8.7 mmol) and tetrahydro-4H-pyran-4-one (1.8 g, 18 mmol) in methanol (60 mL)/acetic acid (1.6 g) was added sodium cyanoborohydride (1.1 g, 17 mmol), portionwise. After stirring 1 hour the reaction was concentrated under reduced pressure and then extracted from saturated aqueous sodium bicarbonate with ethyl acetate. The combined extracts were dried (Na2SO4), concentrated under reduced pressure to give the crude product as a colorless foam (4.1 g, quant). A solution of the product in ether (150 mL) was treated with 1 M ethereal HCl which generated a precipitate that was collected by vacuum filtration to give the title compound (4.1 g, 94%) as a pink solid: +APcI MS (M+1)+464; 1H NMR (methanol-d4) δ: 7.14 (s, 2H), 6.38 (s, 1H), 4.03 (dd, 2H), 3.94 (br t, 2H), 3.86 (s, 3H), 3.50-3.38 (m, 5H), 2.51 (s, 3H), 2.26 (s, 3H), 2.05 (m, 2H), 1.68 (qd, 2H).

Provenance & Evidence