Reacción #1596948

Ecuación de reacción

4-bromo-5-ethyl-2-[3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydropyran

hydrogen

triethylamine

→

5-ethyl-2-[3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydropyran

Disolventes

toluene water

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe organic phase is separated off
2. 2
   Filtraciónfiltered absorptively (SiO2, toluene)
3. 3
   ConcentraciónThe filtrate is concentrated to dryness
4. 4
   Otrothe residue is recrystallised from ethanol at reduced temperature

Procedimiento

18.0 g (36.2 mmol) of 4-bromo-5-ethyl-2-[3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydropyran are hydrogenated for 30 h at a hydrogen pressure of 5 bar and at 80° C. in toluene/water in the presence of Pd/C (5% of Pd) and 12.7 ml (88.1 mmol) of triethylamine. The organic phase is separated off and filtered absorptively (SiO2, toluene). The filtrate is concentrated to dryness, and the residue is recrystallised from ethanol at reduced temperature, giving 5-ethyl-2-[3-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydropyran as a colourless solid.

Fuente