Reacción #73527

Ecuación de reacción

6-chloropyridine-3-carbonyl chloride

2,2-dimethylpropanol

→

2,2-dimethylpropyl 6-chloropyridine-3-carboxylate

Rendimiento 92.0%

Disolventes

EtOAc

toluene

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaAfter cooling to room temperature
2. 2
   Concentraciónthe medium is concentrated
3. 3
   Otrothe residue obtained
4. 4
   Lavadowashed successively with water (2×200 mL), saturated NaHCO3 solution (2×200 mL) and brine (100 mL)
5. 5
   Secadodried over Na2SO4
6. 6
   Concentraciónconcentrated under reduced pressure
7. 7
   Otropurified by chromatography on a column of silica gel
8. 8
   Lavadoeluting with a cyclohexane/EtOAc gradient of 0 to 5% EtOAc

Procedimiento

To a solution of 10 g (56.8 mmol) of 6-chloropyridine-3-carbonyl chloride in 100 mL of anhydrous toluene are added under argon, at room temperature, 15 g (170.4 mmol) of 2,2-dimethylpropanol. The reaction medium is then heated for 6 hours at 80° C. After cooling to room temperature, the medium is concentrated and the residue obtained is taken up in 800 mL of EtOAc, washed successively with water (2×200 mL), saturated NaHCO3 solution (2×200 mL) and brine (100 mL), dried over Na2SO4, and then concentrated under reduced pressure and purified by chromatography on a column of silica gel, eluting with a cyclohexane/EtOAc gradient of 0 to 5% EtOAc. 11.9 g of 2,2-dimethylpropyl 6-chloropyridine-3-carboxylate are obtained in the form of a white powder.

Fuente