Reacción #1350615

Ecuación de reacción

5-(bromomethyl)-1H-indazole hydrogen bromide

5-(bromomethyl)-1H-indazole Hydrogen Bromide

compound 92

5-(bromomethyl)-1H-indazole Hydrogen Bromide

3,4-dihydro-2H-pyran

→

title compound

Rendimiento 80.8%

5-(bromomethyl)-1-(2-tetrahydropyranyl)indazole

Rendimiento 80.8%

Disolventes

THF

methylene chloride

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturawas heated
2. 2
   Temperaturaat reflux temperature for 2 hours
3. 3
   Lavadowashed with saturated aqueous NaHCO3, water and brine
4. 4
   SecadoAfter drying (MgSO4)
5. 5
   Otrothe solvent was removed under vacuum
6. 6
   Otroto give a yellow oil

Procedimiento

A yellow suspension of 5-(bromomethyl)-1H-indazole hydrogen bromide (compound 92, 3.0 g, 14 mmol) and 3,4-dihydro-2H-pyran (Aldrich, 2.4 g, 29 mmol) in THF (100 mL) was heated at reflux temperature for 2 hours. After cooling down to room temperature, the reaction mixture was stirred at room temperature for 12 hours under nitrogen. The reaction mixture was diluted with methylene chloride (250 mL), washed with saturated aqueous NaHCO3, water and brine. After drying (MgSO4), the solvent was removed under vacuum to give a yellow oil. Flash chromatography yielded the title compound (93, 3.34 g, 80%). TLC Rf 0.58 (70:30 hexane-ethyl acetate); MS (electrospray) 295, 297 (M+1); 1H N MR (CDCl3) δ1.57-1.84 (m, 3H), 2.16 (m, 2H), 2.55 (m, 1H), 3.75 (m, 1H), 4.01 (m, 1H), 4.65 (s, 2H), 5.71 (d, 1H, J=9.2 Hz), 7.44 (d, 1H, J=8.8 Hz), 7.59 (d, 1H, J=8.8 Hz), 7.73 (s, 1H), 8.00 (s, 1H).

Fuente