反応 #60883

反応方程式

ethylmagnesium bromide

4,5-Diiodo-1-methyl-1H-imidazole

NH4Cl

tributyltin chloride

→

title compound

収率 76.0%

5-Tributylstannyl-4-iodo-1-methyl-1H-imidazole

収率 76.0%

溶媒

THF

water

反応条件

後処理

1. 1
   workup.STIRRINGThe resulting clear solution was stirred for 1 hr
2. 2
   抽出The reaction mixture was extracted with DCM (500 mL)
3. 3
   洗浄washed with water (3×300 mL)
4. 4
   乾燥dried (MgSO4)
5. 5
   ろ過filtered
6. 6
   濃縮concentrated in vacuo
7. 7
   その他The crude product was purified by flash chromatography on silica eluting with hexane:EtOAc (1:1)

実験手順

4,5-Diiodo-1-methyl-1H-imidazole (40.0 g) was stirred in anhydrous THF (560 mL) at ambient temperature and ethylmagnesium bromide (3M in ether, 42.0 mL) was added over 20 minutes under an inert atmosphere. The resulting white precipitate was stirred for 30 minutes then tributyltin chloride (34.2 mL) added dropwise. The resulting clear solution was stirred for 1 hr, then saturated aqueous NH4Cl (50 mL) and water (300 mL) were added. The reaction mixture was extracted with DCM (500 mL), washed with water (3×300 mL), dried (MgSO4), filtered and concentrated in vacuo. The crude product was purified by flash chromatography on silica eluting with hexane:EtOAc (1:1) to afford the title compound as a colourless oil (45.1 g, 76%);

出典