7-CHLOROPYRAZOLO[1,5-A]PYRIMIDINE Chemical Properties

Melting point:

96-98℃

Density 

1.51

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

form 

Powder

pka

-0.59±0.40(Predicted)

color 

Off-white to yellow to pink to brown

InChI

InChI=1S/C6H4ClN3/c7-5-1-3-8-6-2-4-9-10(5)6/h1-4H

InChIKey

YCZQHXPIKQHABJ-UHFFFAOYSA-N

SMILES

C12=CC=NN1C(Cl)=CC=N2

Safety Information

HS Code 

2933998090

7-CHLOROPYRAZOLO[1,5-A]PYRIMIDINE Usage And Synthesis

Uses

7-Clopizo[1,5-A]pyrimidine is a heterocyclic organic compound that can be used as an organic intermediate.

Synthesis

Pyrazolo[1,5-a]pyrimidin-7(4H)-one (0.50 g, 3.70 mmol) was added with phosphorus trichloride (0.88 mL, 9.62 mmol) and diisopropylethylamine (DIEA, 0.13 mL, 0.74 mmol), mixed well and then the reaction was stirred at 90 °C overnight. After completion of the reaction, the reaction mixture was slowly poured into ice water and extracted with dichloromethane, and the extract was washed with brine. The organic phase was dried over anhydrous sodium sulfate, filtered and concentrated in vacuum. The crude product was purified by silica gel column chromatography (eluent: hexane/ethyl acetate = 9:1) to afford the target compound 7-chloropyrazolo[1,5-a]pyrimidine (83 mg, 71% yield).LRMS (m/z): 154 (M + 1)+.1H NMR (400 MHz, DMSO-d6) δ ppm: 6.93 (d, 1H), 7.43 (d, 1H), 8.37 (d, 1H), 8.37 (d, 1H). 1H), 8.37 (d, 1H), 8.52 (d, 1H).

References

[1] Patent: EP2518071, 2012, A1. Location in patent: Page/Page column 38
[2] Patent: WO2012/146667, 2012, A1. Location in patent: Page/Page column 90
[3] Patent: WO2012/146666, 2012, A1. Location in patent: Page/Page column 160
[4] Patent: WO2007/17678, 2007, A1. Location in patent: Page/Page column 44
[5] Journal of Medicinal Chemistry, 1981, vol. 24, # 5, p. 610 - 613

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