1-(3-chloro-2-pyridinyl)-3-(trifluoromethyl)-1H-pyrazole-5-carbonyl Chloride → 2-[1-(3-Chloro-2-pyridinyl)-3-(trifluoromethyl)-1H-pyrazol-5-yl]-8-methyl-6-nitro-4H-3,1-benzoxazin-4-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 505 mg (1.63 mmol) of the title material from Step A, 344 mg (1.55 mmoles) of 1-(3-chloro-2-pyridinyl)-3-(trifluoromethyl)-1H-pyrazole-5-carbonyl chloride (which can be prepared according to Example 7) and 2 mL of pyridine was heated at 100° C. for 3 hours. The resulting mixture was cooled to 25° C. and partitioned between ethyl acetate and dilute aqueous HCl. The organic layer was washed three times with dilute aqueous HCl, dried over anhydrous magnesium sulfate and concentrated to give a brown solid that was used in the next step without further purification. 1H NMR (CDCl3): δ 8.86 (d, 1H), 8.60 (dd, 1H), 8.38 (d, 1H), 8.03 (dd, 1H), 7.59 (s, 1H), 1.95 (s, 3H).

Provenance & Evidence