Reaktion #73196

Reaktionsgleichung

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

Ausbeute 35.0%

Lösungsmittel

ether

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter 30 minutes reaction time
2. 2
   Sonstigethe solution was quenched by the addition of saturated ammonium chloride aqueous solution
3. 3
   ExtraktionThe product was extracted with ethyl acetate
4. 4
   Waschenthe combined organic extracts were washed with brine
5. 5
   Trocknendried over Na2SO4
6. 6
   Filtrationfiltered
7. 7
   Einengenconcentrated
8. 8
   SonstigeThe crude residue was purified by flash column chromatography (0-20% ethyl acetate/hexanes)

Vorschrift

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).

Quelle