Water → methyl 2-[2-(3,4-dihydro-2H-1-benzopyran-6-yl)-1-methyl-1H-indol-3-yl]pentanoate

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, sodium carbonate (370 mg, 3.5 mmol), water (20 mL), palladium tetrakis(triphenylphosphine) (620 mg, 0.54 mmol) and 6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)chroman (904 mg, 3.48 mmol) were added to a solution of methyl 2-(2-bromo-1-methyl-1H-indol-3-yl)pentanoate (1.13 g, 3.4 mmol) in N,N-dimethylformamide (80 mL). The mixture was heated at 110° C. for 2 hours, concentrated in vacuo and water (40 mL) was added. The aqueous layer was extracted with ethyl acetate (2×20 mL). The organic layer was washed with brine (20 mL), dried over sodium sulfate, filtered and evaporated under reduced pressure. The residue was purified by flash chromatography on silica gel (cyclohexane/ethyl acetate 95/5) to afford the desired product (12d) as a white solid (1.1 g, 2.91 mmol, 86%).

Provenance & Evidence