Reacción #1605761

Ecuación de reacción

Iodomethane

(R)—N-(1-hydroxy-4-methylpentan-2-yl)-3,4-dimethylbenzamide

NaOH

→

(R)—N-(1-methoxy-4-methylpentan-2-yl)-3,4-dimethylbenzamide

Rendimiento 73.1%

Disolventes

DMF

DMF

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrowas kept at 0° C.
2. 2
   workup.STIRRINGthe mixture was stirred for 1 hr
3. 3
   OtroThe reaction was quenched
4. 4
   workup.ADDITIONby adding 300 ml of water
5. 5
   ExtracciónThe aqueous layer was extracted with dichloromethane
6. 6
   Secadodried over MgSO4
7. 7
   Otroevaporated
8. 8
   OtroThe residue was purified by flash chromatography on silica-gel (toluene-ethyl acetate; 5-20% gradient)

Procedimiento

To a solution of (R)—N-(1-hydroxy-4-methylpentan-2-yl)-3,4-dimethylbenzamide (1.59 g, 6.39 mmol) (example 18a) in dry DMF (20 mL) was added powdered NaOH (281 mg, 7 mmol) an the solution was stirred at 0° C. for 2 hrs. Iodomethane (1 eq, 6.39 mmol) was added in DMF (10 ml) drop-wise over period of 1 hr. The temperature was kept at 0° C. and the mixture was stirred for 1 hr. The reaction was quenched by adding 300 ml of water. The aqueous layer was extracted with dichloromethane, dried over MgSO4 and evaporated. The residue was purified by flash chromatography on silica-gel (toluene-ethyl acetate; 5-20% gradient) to give 1.23 g (R)—N-(1-methoxy-4-methylpentan-2-yl)-3,4-dimethylbenzamide (73%). 1H NMR (500 MHz, CDCl3): ÿ 0.94-0.97 (t, 6H), 1.41-1.47 (M, 1H), 1.54-1.60 (m, 1H), 1.64-1.68 (m, 1H), 2.29 (d, 6H)5 3.36 (s3 3H), 3.45-3.50 (m, 2H), 4.34-4.39 (m, 1H), 6.23-6.25 (d, 1H), 7.16-7.17 (d, 1H), 7.47-7.49 (dd, 1H), 7.56 (s, 1H). MS (M+H, 264.3).

Fuente