4-methylsulfonyl-substituted piperidine urea compounds

on of 4-(((1-isopropyl-1H-pyrazol-4-yl)sulfonyl)methyl)-N-(pyridin-4-yl)piperidine-1-carboxamide

[0072]

Compound 1.1. tert-Butyl 4-((tosyloxy)methyl)piperidine-1-carboxylate

[0073]A solution of tert-butyl 4-(hydroxymethyl)piperidine-1-carboxylate (50 g, 232.25 mmol, 1.00 equiv), triethylamine (35.2 g, 347.86 mmol, 1.50 equiv), 4-dimethylaminopyridine (2.8 g, 22.92 mmol, 0.10 equiv) and 4-methylbenzene-1-sulfonyl chloride (53 g, 278.00 mmol, 1.20 equiv) in CH2Cl2 (500 mL) was stirred under argon overnight at room temperature. The solids were removed by filtration, and the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column (Ethyl Acetate / Petroleum ether=1 / 3 9 v / v)) to provide 78 g (91%) as a yellow solid. 1H-NMR (400 MHz, DMSO-d6): δ 7.78 (d, J=8.4 Hz, 2H), 7.48 (d, J=8.4 Hz, 2H), 3.87 (m, 4H), 2.49 (m, 2H), 2.42 (s, 3H), 1.76 (m, 1H), 1.53 (m, 2H), 1.36 (s, 9H), 0.96 (m, 2H) ppm.

Compound 1.2. tert-Butyl 4-((carbamimidoylthio)meth

on of N-(Pyridazin-4-yl)-4-(1-((4-(trifluoromethoxy)phenyl)sulfonyl)cyclopropyl)piperidine-1-carboxamide

[0080]

Compound 2.1. 4-(((4-(Trifluoromethoxy)phenyl)thio)methyl)pyridine

[0081]A solution of 4-(chloromethyl)pyridine (625 mg, 4.90 mmol, 1.00 equiv), K2CO3 (1.35 g, 9.70 mmol, 2.00 equiv) and 4-(trifluoromethoxy)benzene-1-thiol (950 mg, 4.89 mmol, 1.00 equiv) in DMF (10 mL) was stirred overnight at room temperature under argon, and the solids were removed by filtration. The filtrate was diluted with H2O (30 mL), and the resulting solution was extracted with EtOAc (3×20 mL). The combined organic layers were washed with brine (2×20 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The resulting residue was purified on silica gel (EtOAc / petroleum ether) to provide 1.3 g (93%) of a light yellow oil.

Compound 2.2. 4-(((4-(Trifluoromethoxy)phenyl)sulfonyl)methyl)pyridine

[0082]A solution of 4-(((4-(trifluoromethoxy)phenyl)thio)methyl)pyridine (2.1, 800 mg,

on of 4-(((2-Cyano-4-(trifluoromethyl)phenyl)sulfonyl)-difluoromethyl)-N-(pyridazin-4-yl)piperidine-1-carboxamide

[0086]

Compound 3.1. S-(Pyridin-4-ylmethyl) ethanethioate

[0087]To a mixture of 4-(chloromethyl)pyridine hydrochloride (9 g, 54.87 mmol, 1.00 equiv) and K2CO3 (7.6 g, 54.99 mmol, 1.50 equiv) in DMF (50 mL) under argon was added potassium thioacetate (9.38 g, 82.13 mmol, 1.00 equiv) in several batches at 0° C. The resulting mixture was stirred for 1 h at 50° C. in an oil bath. After cooling to room temperature the reaction was quenched by the addition of ice water (500 mL). The resulting solution was extracted with EtOAc (3×300 mL). The combined organic layers were washed with brine (2×500 mL), dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure to provide 9 g (98%) of a brown liquid. MS (ES, m / z): 168 [M+H]+.

Compound 3.2. 4-(((2-Bromo-4-(trifluoromethyl)phenyl)thio)methyl)pyridine

[0088]A mixture of S-(pyridin-4-ylmethyl) ethanethioate (3.1, 4.75 g,