Hydrochloric Acid → 5,7-dimethyl-N-(2,6-difluorophenyl)pyrazolo[1,5-a]pyrimidine-2-sulfonamide

HRID 981441Notes

Reaction equation

C([C:6]1[C:7]([S:17]([NH:20][C:21]2[C:26]([F:27])=[CH:25][CH:24]=[CH:23][C:22]=2[F:28])(=[O:19])=[O:18])=[N:8][N:9]2[C:14]([CH3:15])=[CH:13][C:12]([CH3:16])=[N:11][C:10]=12)(OCC)=O.Cl.O>CC(O)=O>[CH3:16][C:12]1[CH:13]=[C:14]([CH3:15])[N:9]2[N:8]=[C:7]([S:17]([NH:20][C:21]3[C:26]([F:27])=[CH:25][CH:24]=[CH:23][C:22]=3[F:28])(=[O:18])=[O:19])[CH:6]=[C:10]2[N:11]=1

Participants

Conditions

Temperature: 110 °C

Procedure

A slurry of 4.8 g (10.8 mmole) of 3-carboethoxy-5,7-dimethyl-N-(2,6-difluorophenyl)pyrazolo[1,5-a]pyrimidine-2-sulfonamide in 30 ml glacial HOAc was stirred at room temperature with 1 ml concentrated HCl and 3 ml water for 2 hours. The mixture was then heated at 110° C. for 16 hours. A further 1 ml concentrated HCl and 5 ml water were added and the mixture stirred for 16 hours, then cooled to room temperature. The mixture was thrown onto ice and the resultant solid collected by filtration, washed with water and dried to give 2.34 g (64 percent) of the product as a brown powder, m.p. 201°-208° C. An analytical sample was recrystallized from CH3CN/EtOAc/CH3OH, m.p. 209°-211° C. (dec). 1H NMR (DMSO-d-6): 10.3 (s, 1H, NH), 7.37 (m, 1H, benzene), 7.10 (m including s, 3H, aromatic and H-3 or H-6), 6.82 (s, 1H, H-3 or H-6), 2.63 (s, 3H, CH3), 2.53 (s, 3H, CH3). IR (KBr): 3400, 3050, 2800, 1625, 1600, 1540, 1480, 1430, 1325, 1290, 1240, 1170, 1140, 1000. Analysis: Calculated for C14H12N4F2O2S: C, 49.70; H, 3.58; N, 16.56. Found: C, 48.68; H, 3.74, N, 15.98.

Workup

temperaturecooled to room temperature
filtrationthe resultant solid collected by filtration
washwashed with water
customdried

Sources & evidence

ORD record: ord-9968a5d92c1047e0a32f3ad79a02e2fb
Source dataset: uspto-grants-1991_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04992091

Reaction notes

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