Reacción #657319

Ecuación de reacción

4-[2-(4-fluorophenyl)-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-yl]pyridin-2-amine

Huenigs base

cyclopropanecarbonyl chloride

→

N-{4-[2-(4-fluorophenyl)-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-yl]pyridin-2-yl}cyclo-propanecarboxamide

Rendimiento 33.7%

Disolventes

tetrahydrofuran

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroNext, the volatile components are removed under vacuum
2. 2
   workup.ADDITIONthe crude material treated with 3 mL NH3 in methanol (7 molar)
3. 3
   workup.STIRRINGThe mixture is stirred for 16 hrs at room temperature
4. 4
   Otroevaporated
5. 5
   OtroThe crude product is purified by preparative HPLC (Phenomenex AMA Gemini C18
6. 6
   workup.ADDITION10 μm 100×30 mm, gradient: 0-2.0 mins 80% water, 20% acetonitrile, 2.0-12.0 mins linear gradient up to 25% water, 75% acetonitrile, 12.0-16.0 mins 5% water, 95% acetonitrile, modifier 15% NH4OH in H2O, addition of the modifier at 1.0 mL/min throughout the separation)

Procedimiento

93 mg (0.3 mmol) of 4-[2-(4-fluorophenyl)-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-yl]pyridin-2-amine and 46 mg (0.36 mmol, 1.2 eq) of Huenigs base are dissolved in 2 mL tetrahydrofuran. To this are added 63 mg of cyclopropanecarbonyl chloride (0.6 mmol, 2 eq) and the reaction mixture is stirred for 16 hrs at room temperature. Next, the volatile components are removed under vacuum and the crude material treated with 3 mL NH3 in methanol (7 molar). The mixture is stirred for 16 hrs at room temperature and then evaporated. The crude product is purified by preparative HPLC (Phenomenex AMA Gemini C18; 110 A; 10 μm 100×30 mm, gradient: 0-2.0 mins 80% water, 20% acetonitrile, 2.0-12.0 mins linear gradient up to 25% water, 75% acetonitrile, 12.0-16.0 mins 5% water, 95% acetonitrile, modifier 15% NH4OH in H2O, addition of the modifier at 1.0 mL/min throughout the separation). 38.2 mg (33%) of N-{4-[2-(4-fluorophenyl)-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-yl]pyridin-2-yl}cyclo-propanecarboxamide are obtained as a colourless solid.

Fuente