Potassium Phosphate, Tribasic → HCID 66790728, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-bromo-4-(4-fluorophenyl)-2,2-dimethyl-7-nitro-2H-1,4-benzoxazin-3(4H)-one (compound obtained in Reference Example 53(6), 200 mg), cyclopropylboronic acid (65 mg), potassium phosphate (410 mg), tetrakis-(triphenylphosphine)palladium(0) (66 mg), water (0.1 mL) and toluene (5 mL) was heated at 100° C. under argon atmosphere for 4 hours. After cooling, to the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, dried over sodium sulfate and concentrated in vacuo. The resultant residue was purified by column chromatography on silica gel (Solvent; n-hexane/ethyl acetate=95/5→65/35) to give 5-cyclopropyl-4-(4-fluorophenyl) -2,2-dimethyl-7-nitro-2H-1,4-benzoxazin-3(4H)-one (146 mg) as a pale yellow powder.

Provenance & Evidence