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N-Cyclohexyl-N-methyl-4-(1-oxido-3-pyridinyl)-1H-imidazole-1-carboxamide is a potential fatty acid amide hydrolase (FAAH) inhibitor used for treating and preventing diseases.

In a further step of this synthesis, N-cyclohexyl-N-methyl-4-(pyridin-3-yl)-1H-imidazole-1-carboxamide (90 g, 317 mmol) was dissolved in dichloromethane (1350 ml) in a 2L reactor followed by addition of peracetic acid (84 ml, 475 mmol). The reaction mixture was stirred at 25 °C and the progress of the reaction was monitored by HPLC until N-cyclohexyl-N-methyl-4-(pyridin-3-yl)-1H-imidazole-1-carboxamide was completely consumed. After completion of the reaction, an aqueous solution (270 ml) of sodium metabisulfite (60.2 g, 317 mmol) was slowly added, keeping the reaction temperature below 30 °C. After performing phase separation, the organic phase was washed with water. After phase separation again, the organic phase was concentrated to 1/5 of the original volume at atmospheric pressure.Subsequently, the solvent was replaced with isopropanol (1350 ml) and the suspension was cooled down to 0 °C over a period of 4 hours and stirring was continued at this temperature for 1 hour. The resulting white crystalline solid was collected by filtration and washed sequentially with water (270 ml) and isopropanol (270 ml) to give 84.8 g (89% yield) of the target product.

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[1] Patent: WO2012/15324, 2012, A1. Location in patent: Page/Page column 58-59
[2] Patent: US2012/65191, 2012, A1. Location in patent: Page/Page column 32
[3] Patent: WO2014/17938, 2014, A2. Location in patent: Page/Page column 67; 68