Sodium hydride → 6-bromo-2-methyl-1-(2-trimethylsilanylethoxymethyl)-1H-imidazo[4,5-b]pyridine
Reaction equation
[Br:1][C:2]1[CH:3]=[C:4]2[NH:10][C:9]([CH3:11])=[N:8][C:5]2=[N:6][CH:7]=1.[H-].[Na+].[CH3:14][Si:15]([CH3:22])([CH3:21])[CH2:16][CH2:17][O:18][CH2:19]Cl>CN(C)C=O.O1CCCC1>[Br:1][C:2]1[CH:3]=[C:4]2[N:10]([CH2:19][O:18][CH2:17][CH2:16][Si:15]([CH3:22])([CH3:21])[CH3:14])[C:9]([CH3:11])=[N:8][C:5]2=[N:6][CH:7]=1Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 2
Procedure
To a solution of 6-bromo-2-methyl-1H-imidazo[4,5-b]pyridine (3.0 g, 14.1 mmol) in a mixture of N,N-dimethylformamide and tetrahydrofuran (30 mL, 2:1) at 0° C. was added 60% sodium hydride in mineral oil (0.68 g, 17.0 mmol) and the reaction mixture was stirred for 30 minutes, followed by the addition of 2-(trimethylsilyl)ethoxymethyl chloride (2.7 mL, 14.9 mmol). The reaction mixture was stirred for 16 hours at room temperature then it was quenched by the careful addition of water and diluted with ethyl acetate (250 mL), washed with brine (3×150 mL), dried over sodium sulfate, filtered and concentrated. Gradient column chromatography (10% to 30% ethyl acetate in hexane) provided 6-bromo-2-methyl-1-({[2-(trimethylsilyl)ethyl]oxy}methyl)-1H-imidazo[4,5-b]pyridine (4.4 g, 92%). 1H NMR (400 MHz, CDCl3): 8.41 (s, 1H), 8.12 (s, 1H), 5.67 (s, 2H), 3.62 (m, 2H), 2.76 (s, 3H), 0.96 (m, 2H), 0.00 (s, 9H). MS (EI) for C13H20BrN3OSi: 342, 344 (MH+, Br iotope pattern).
Workup
- stirringThe reaction mixture was stirred for 16 hours at room temperature
- customit was quenched by the careful addition of water
- additiondiluted with ethyl acetate (250 mL)
- washwashed with brine (3×150 mL)
- dry with materialdried over sodium sulfate
- filtrationfiltered
- concentrationconcentrated
Sources & evidence
- ORD record
- ord-e673715d046c4b06be3df37d5be5c143
- Source dataset
- uspto-grants-2014_02
- Patent number
- US08648066B2
Reaction notes
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