Cyclopropylboronic acid → HCID 68227816, compound

Participants

Reaction Steps

A solution of cyclopropyl boronic acid (0.67 g), 2-bromo-4-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzoic acid methyl ester (3 g) and Bis(triphenylphosphine)palladium(II) chloride (210 mg) were sequentially added to degassed toluene (38 ml). The reaction mixture was stirred for 30 min at room temperature then a degassed aqueous 2N solution of potassium phosphate (7 ml) was added and the resulting mixture was heated at 110° C. overnight. The reaction mixture was filtered over Hyflo and the resulting solution was concentrated in vacuo to give a yellow oil, which was poured into ethyl acetate. The organic phase was washed with water, dried over sodium sulfate, and the solvents were evaporated in vacuo. The product was used as such for the saponification step, as described in Example 17, Step E to afford the title acid compound (2.5 g) as a yellow solid. LCMS (Method F) 2.15 min M−H 442/444.

Provenance & Evidence