1-Butanol → (R)-5-(2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidine

HRID 1893760Notes

Reaction equation

Cl[C:2]1[CH:7]=[CH:6][N:5]2[N:8]=[CH:9][CH:10]=[C:4]2[N:3]=1.[F:11][C:12]1[CH:17]=[CH:16][C:15]([F:18])=[CH:14][C:13]=1[C@H:19]1[CH2:23][CH2:22][CH2:21][NH:20]1.C(O)CCC.CCN(C(C)C)C(C)C>CCOC(C)=O>[F:11][C:12]1[CH:17]=[CH:16][C:15]([F:18])=[CH:14][C:13]=1[C@H:19]1[CH2:23][CH2:22][CH2:21][N:20]1[C:2]1[CH:7]=[CH:6][N:5]2[N:8]=[CH:9][CH:10]=[C:4]2[N:3]=1

Participants

Conditions

Temperature: 160 °C

Procedure

In a pressure reaction tube was added 5-chloropyrazolo[1,5-a]pyrimidine (4.2 g, 27 mmol), (R)-2-(2,5-difluorophenyl)pyrrolidine (Preparation A; 5.3 g, 29 mmol), anhydrous n-butanol (5 ml, 55 mmol), and DIEA (9.5 ml, 55 mmol). The yellowish suspension was sealed and heated in an oil bath (160° C.) overnight. The reaction was cooled to ambient temperature, diluted with EtOAc (250 mL), and filtered, rinsing the solid with EtOAc. The filtrate (330 mL) was washed with water (2×150 mL), brine (100 mL), concentrated, and purified by silica chromatography, eluting with 2:1 EtOAc/hexanes to give the product as a bright yellowish solid (5.6 g, 68% yield).

Workup

customIn a pressure reaction tube
customPreparation A
customThe yellowish suspension was sealed
temperatureThe reaction was cooled to ambient temperature
filtrationfiltered
washrinsing the solid with EtOAc
washThe filtrate (330 mL) was washed with water (2×150 mL), brine (100 mL)
concentrationconcentrated
custompurified by silica chromatography
washeluting with 2:1 EtOAc/hexanes

Sources & evidence

ORD record: ord-223a041849244f3c9d634b4ea6e186f9
Source dataset: uspto-grants-2013_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08513263B2

Reaction notes

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