Tetrahydrofuran → 3-bromo-N-[4-chloro-2-(hydrazinocarbonyl)-6-methylphenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide

Participants

Reaction Steps

A mixture of 0.40 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-6-chloro-8-methyl-4H-3,1-benzoxazine-4-one, 0.08 ml of hydrazine monohydrate and 10 ml of tetrahydrofuran was stirred at room temperature for 3 hours. The reaction mixture was poured into water and then filtered. The resulting filter cake was washed with water and methyl tert-butyl ether. The filter cake was dissolved in ethyl acetate, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to obtain 0.35 g of 3-bromo-N-[4-chloro-2-(hydrazinocarbonyl)-6-methylphenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide of the formula:

Provenance & Evidence