Cesium carbonate → N-[3-[5-chloro-2-(difluoromethoxy)phenyl]-1-[2-(1,4-dioxa-8-azaspiro[4,5]decan-8-yl)-2-oxo-ethyl]pyrazol-4-yl]pyrazolo[1,5-a]pyrimidine-3-carboxamide

Participants

Reaction Steps

A solution of pyrazolo[1,5-a]pyrimidine-3-carboxylic acid [3-(5-chloro-2-difluoromethoxy-phenyl)-1H-pyrazol-4-yl]-amide (32.0 g, 79.1 mmol) in DMF (400 mL) was treated with 2-chloro-1-(1,4-dioxa-8-aza-spiro[4.5]dec-8-yl)-ethanone (20.8 g, 94.9 mmol) and Cs2CO3 (51.5 g, 158.1 mmol) and the mixture was stirred at room temperature for 19 hours. The reaction was diluted with water (˜1.6 L) and the resultant precipitate was collected by filtration. The solid was washed with water dried under reduced pressure to afford pyrazolo[1,5-a]pyrimidine-3-carboxylic acid {3-(5-chloro-2-difluoromethoxy-phenyl)-1-[2-(1,4-dioxa-8-aza-spiro[4.5]dec-8-yl)-2-oxo-ethyl]-1H-pyrazol-4-yl}-amide as a beige solid (33.3 g, 72%). LCMS (Method 3) [M+H]+=588.2, RT=3.02 min. 1H NMR (400 MHz, CDCl3) δ: (ppm) 9.85 (s, 1H), 8.78 (dd, 1H, J=1.6, 6.9 Hz), 8.71 (s, 1H), 8.56 (dd, 1H, J=1.8, 4.0 Hz), 8.42 (s, 1H), 7.69 (d, 1H, J=2.5 Hz), 7.41 (dd, 1H, J=2.7, 8.7 Hz), 7.30-7.26 (m, 1H), 7.00 (dd, 1H, J=4.2, 6.9 Hz), 6.48 (t, 1H, J=74.0 Hz), 5.06 (s, 2H), 4.00-3.95 (m, 4H), 3.74 (dd, 2H, J=5.8, 5.8 Hz), 3.61 (dd, 2H, J=5.8, 5.8 Hz), 1.74-1.64 (m, 4H).

Provenance & Evidence