Hydrochloric Acid → 6-cyclopentyl-4H-isoquinoline-1,3-dione

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Reaction Steps

To 6-bromo-1,3-bis-(tert-butyl-dimethyl-silanyloxy)-isoquinoline (1.76 g, 3.75 mmole) is added tetrakis(triphenylphosphine)palladium (110 mg, 0.095 mmole) and 2M cyclopentyl magnesium bromide in ether (3.0 mL, 6.0 mmole). This mixture is heated using a microwave reactor at 75° C. for 600 sec. The mixture is cooled to room temperature, transferred to a flask with THF and water, then 2M hydrochloric acid (20 mL) is added and stirred for 4 hours at room temperature. The organic solvents were removed in vacuo, the mixture extracted with ethyl acetate, the organic layer dried over sodium sulfate filtered, evaporated and chromatographed with hexanes-ethyl acetate on silica gel to give a white solid, 268 mg (31%) MS (ESI): m/z 230.2 (M+H).

Provenance & Evidence