Реакция #1605761

Уравнение реакции

Iodomethane

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

NaOH

→

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

Выход 73.1%

Растворители

DMF

DMF

Условия реакции

Обработка

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

Методика

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).

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