1,4-Dioxane → Methyl 2'-fluoro-5'-(methyloxy)-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,1'-biphenyl-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

A screw-cap vial was charged with 66.15D (2.08 g, 5.39 mmol), 1,4-dioxane (20 mL), and dichloro[1,1′-bis(diphenylphosphino)ferrocene]palladium(II) DCM adduct (available from Strem) (0.220 g, 0.269 mmol). The suspension was sparged with N2, and to it were added TEA (2.25 mL, 16.2 mmol) and 4,4,5,5-tetramethyl-1,3,2-dioxaborolane (available from Aldrich) (1.17 mL, 8.08 mmol). The resulting mixture was stirred overnight at 100° C. (sealed vial), cooled to room temperature, diluted with water, and extracted with EtOAc. The combined organic layers were washed with water, 1 N HCl, and brine, dried (MgSO4), and concentrated. The crude product was twice purified by silica gel flash chromatography (0-15% EtOAc/hexane) to afford 66.56A (1.09 g, 52% yield) as a crystalline white solid.

Provenance & Evidence