Phosphorus oxychloride → Ethyl 2-(7-chloro-3-mesityl-2,5-dimethylpyrazolo[1,5-a]pyrimidin-6-yl)acetate

Reaction equation

P(Cl)(Cl)([Cl:3])=O.[C:6]1([CH3:32])[CH:11]=[C:10]([CH3:12])[CH:9]=[C:8]([CH3:13])[C:7]=1[C:14]1[C:15]([CH3:31])=[N:16][N:17]2[C:22](=O)[C:21]([CH2:24][C:25]([O:27][CH2:28][CH3:29])=[O:26])=[C:20]([CH3:30])[NH:19][C:18]=12.C(=O)(O)[O-].[Na+]>>[Cl:3][C:22]1[N:17]2[N:16]=[C:15]([CH3:31])[C:14]([C:7]3[C:8]([CH3:13])=[CH:9][C:10]([CH3:12])=[CH:11][C:6]=3[CH3:32])=[C:18]2[N:19]=[C:20]([CH3:30])[C:21]=1[CH2:24][C:25]([O:27][CH2:28][CH3:29])=[O:26]

Participants

Reactant 3

HCID 24813Phosphorus oxychloride

HCID 516892Sodium Bicarbonate

HCID 178470721HCID 178470721, compound

Product 1

HCID 22249832Ethyl 2-(7-chloro-3-mesityl-2,5-dimethylpyrazolo[1,5-a]pyrimidin-6-yl)acetateYield 103.2%

Procedure

Phosphorus oxychloride (1.7 g) was added to ethyl 2-(3-mesityl-2,5-dimethyl-7-oxo-4,7-dihydropyrazolo[1,5-a]pyrimidin-6-yl)acetate (120 mg) of Reference Example 27 at room temperature, followed by stirring for one hour under heating under reflux. After cooling, the reaction solution was poured onto ice. The reaction mixture was basified with an aqueous saturated solution of sodium bicarbonate, and then extracted twice with ethylacetate. The organic layer was washed with brine, and then dried over anhydrous magnesium sulfate. The solvent was evaporated, to give the title compound (130 mg) as a reddish brown oil.