Acetonitrile → HCID 178485326, Verbindung

Temperatur

-78 °C

1.8M LDA in THF (30.0 mL, 54.00 mmol) was added to tetrahydrofuran (60 mL) and cooled to −78° C. Acetonitrile (2.82 mL, 54.00 mmol) was added drop-wise over 15 mins. A solution of methyl 3-(3-(methylcarbamoyl)phenyl)propanoate (2.99 g, 13.5 mmol) in tetrahydrofuran (10 ml) was added. The resulting mixture stirred at −78° C. for 10 mins. The reaction mixture was warmed to 5° C. and stirred for 30 mins, hydrazine hydrochloride (3.70 g, 54.00 mmol) and ethanol (60.0 mL) were added and the reaction mixture heated at 80° C. for 18 h. The reaction mixture was cooled and evaporated to dryness. The residue was dissolved in methanol (50 ml) and the crude product was purified by ion exchange chromatography, using a SCX column. The desired product was eluted from the column using 7M NH3/MeOH fractions were evaporated to dryness to afford an oil. The crude product was purified by silica column chromatography, eluting with a gradient of 0 to 10% MeOH in DCM. Pure fractions were evaporated to dryness to afford 3-(2-(5-amino-1H-pyrazol-3-yl)ethyl)-N-methylbenzamide (0.450 g, 13.64%) as a yellow oil.

1. temperatureThe reaction mixture was warmed to 5° C.
2. stirringstirred for 30 mins
3. temperaturethe reaction mixture heated at 80° C. for 18 h
4. temperatureThe reaction mixture was cooled
5. customevaporated to dryness
6. dissolutionThe residue was dissolved in methanol (50 ml)
7. customthe crude product was purified by ion exchange chromatography
8. washThe desired product was eluted from the column
9. customwere evaporated to dryness
10. customto afford an oil
11. customThe crude product was purified by silica column chromatography
12. washeluting with a gradient of 0 to 10% MeOH in DCM
13. customPure fractions were evaporated to dryness

ORD-Eintrag

ord-eff79fa26aa240bc81f5e8c3d8e4cfc1

Quelldatensatz

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07737149B2