Реакция #73196

Уравнение реакции

4-bromo-1-[2-(trimethylsilyl)ethoxy]methyl-1H-pyrrolo[2,3-b]pyridine

isopropylmagnesium chloride

2-chloro-N-methoxy-N-methylacetamide

→

2-chloro-1-(1-[2-(trimethylsilyl)-ethoxy]methyl-1H-pyrrolo[2,3-b]pyridin-4-yl)ethanone

Выход 35.0%

Растворители

ether

THF

THF

Условия реакции

Обработка

1. 1
   ДругоеAfter 30 minutes reaction time
2. 2
   Другоеthe solution was quenched by the addition of saturated ammonium chloride aqueous solution
3. 3
   ЭкстракцияThe product was extracted with ethyl acetate
4. 4
   Промывкаthe combined organic extracts were washed with brine
5. 5
   Сушкаdried over Na2SO4
6. 6
   Фильтрацияfiltered
7. 7
   Концентрированиеconcentrated
8. 8
   ДругоеThe crude residue was purified by flash column chromatography (0-20% ethyl acetate/hexanes)

Методика

To a solution of 4-bromo-1-[2-(trimethylsilyl)ethoxy]methyl-1H-pyrrolo[2,3-b]pyridine (2.05 g, 0.00626 mol) in THF (10 mL, 0.123 mol) at 0° C. was added dropwise a solution of isopropylmagnesium chloride in ether (2.0 M, 9.4 mL). The mixture was allowed to warm to room temperature and stirred for 4 hours. This mixture was then transferred via cannula to a solution of 2-chloro-N-methoxy-N-methylacetamide (2.84 g, 0.0207 mol) in THF (10 ml). After 30 minutes reaction time, the solution was quenched by the addition of saturated ammonium chloride aqueous solution. The product was extracted with ethyl acetate, the combined organic extracts were washed with brine, dried over Na2SO4, filtered and concentrated. The crude residue was purified by flash column chromatography (0-20% ethyl acetate/hexanes) to afford 2-chloro-1-(1-[2-(trimethylsilyl)-ethoxy]methyl-1H-pyrrolo[2,3-b]pyridin-4-yl)ethanone (711 mg, 35%). 1H NMR (400 MHz, CDCl3): 8.56 (d, 1H), 7.66 (d, 1H), 7.60 (d, 1H), 7.23 (d, 1H), 5.80 (s, 2H), 4.91 (s, 2H), 3.60 (dd, 2H), 0.98 (dd, 2H), 0.01 (s, 9H); MS(ES): 325 (M+1).

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