3-Methylpyridine → Chlorantraniliprole

참여 물질

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반응 단계

To a mixture of 3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxylic acid (see PCT Patent Publication WO 03/015519 for preparation) (93.6% purity, 16.16 g, 50.0 mmol) and 2-amino-5-chloro-N,3-dimethylbenzamide (i.e. the product of Examples 1, 3, 4 and 5) (10.43 g, 52.5 mmol) in acetonitrile (35 mL) was added 3-picoline (12.65 mL, 12.11 g, 130 mmol). The mixture was cooled to −5° C., and then a solution of methanesulfonyl chloride (4.64 mL, 6.89 g, 60 mmol) in acetonitrile (10 mL) was added dropwise at −5 to 0° C. The mixture was stirred for 15 minutes at this temperature, and then for 3 h at room temperature. Then water (15 mL) was added dropwise and the mixture was cooled to 0° C. for 1 h. The mixture was filtered, and the solids were washed with 3:1 acetonitrile-water (2×10 mL), and then with acetonitrile (2×10 mL), and dried under nitrogen to afford the title compound as a light tan powder, 23.98 g (92.9% uncorrected yield), m.p. 239 to 240° C.

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