2-Chloromethylbenzimidazole → 2-Chloromethyl-1-(2-trimethylsilylethoxymethyl)-1H-benzimidazole

To a stirred solution of 2-chloromethylbenzimidazole (1.89 g, 11.4 mmol) in dry THF (57 mL) was added N,N-diisopropylethylamine (3.00 mL, 17.2 mmol) and 2-(trimethylsilyl)ethoxymethyl chloride (1.90 mL, 10.8 mmol) both via syringe under nitrogen at room temperature. The mixture was stirred for 3 days at which time the solvent was removed in vacuo. The residue was taken up in CH2Cl2 (100 mL) and washed with water (100 mL) and brine (100 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to afford the crude product as a yellow oil. Purification by flash chromatography (silica gel, 100:2:1 CH2Cl2-methanol-ammonium hydroxide) provided 2.17 g (65%) of the title compound as a yellow oil, which solidified on standing. 1H NMR (CDCl3) δ−0.06 (s, 9H), 0.92 (t, 2H, J=7.5 Hz), 3.57 (t, 2H, J=7.5 Hz), 4.91 (s, 2H), 5.65 (s, 2H), 7.31–7.36 (m, 2H), 7.50 (d, 1H, J=7.5 Hz), 7.78 (d, 1H, J=7.5 Hz).

1. customwas removed in vacuo
2. washwashed with water (100 mL) and brine (100 mL)
3. dry with materialThe organic layer was dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customto afford the crude product as a yellow oil
7. customPurification by flash chromatography (silica gel, 100:2:1 CH2Cl2-methanol-ammonium hydroxide)

ORD record

ord-da10064715ba4368ab44a1416b1d9cee

Source dataset

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07084155B2