5-bromo-3-[2-(N,N-dimethylamino)ethyl]-1-benzoylindole → 5-(3,4-dihydropyran-4-yl)-3-[2-(N,N-dimethylamino)ethyl]-1-benzoylindole

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A solution of 5-bromo-3-[2-(N,N-dimethylamino)ethyl]-1-benzoylindole (Example 5a, 180 mg 0.48 mmol), 4-tributylstannyl-3,4-dihydropyran (180 mg, 0.48 mmol) and tetrakistriphenyphosphine palladium (118 mg, 0.1 mmol) in toluene (3 mL) was stirred at 100-110° C. A second portion of catalyst was added after 1 h and heating was continued overnight. After removal of the solvent in vacuo, flash chromatography on silica gel (2-6% 2M methanolic ammonia in dichloromethane) yielded 5-(3,4-dihydropyran-4-yl)-3-[2-(N,N-dimethylamino)ethyl]-1-benzoylindole (30.5 mg, 17%).

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