Water → 2-(3-Chloro-pyridin-2-yl)-5-trifluoromethyl-2H-pyrazole-3-carboxylic acid [4-chloro-2-methyl-6-(3-methyl-thietan-3-ylcarbamoyl)-phenyl]-amide

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-chloro-2-[1-(3-chloro-2-pyridinyl)-3-(trifluoromethyl)-1H-pyrazol-5-yl]-8-methyl-4H-3,1-benzoxazin-4-one (1.13 g, 2.56 mmol) (prepared according to WO 02/48115, example 2D) in tetrahydrofuran (15 ml) is added 3-amino-3-methyl-thietane (the product of step 3) (0.66 g, 6.40 mmol), and the mixture is heated for 48 hours at 50° C., then to reflux for 12 hours. The cooled reaction mixture is poured into water, extracted with ethyl acetate, the combined organic layers washed with water and brine, dried (Na2SO4), filtered, and concentrated. The crude product is purified by flash chromatography (ethyl acetate/hexane 1:2) to afford 560 mg (40%) of the title compound as a white solid, m.p. 238-241° C.

Provenance & Evidence