Cesium carbonate → 6-Chloro-1-(2,2-difluoro-ethyl)-1H-pyrrolo[3,2-b]pyridine-5-carboxylic acid ethyl ester

関与物質

反応手順

To a solution of 6-chloro-1H-pyrrolo[3,2-b]pyridine-5-carboxylic acid ethyl ester (210 mg, 0.935 mmol) in DMF (10 ml) was added cesium carbonate (457 mg, 1.402 mmol), after 15 min stirring at room temperature 1,1-difluoro-2-iodoethane (538 mg, 2.8 mmol) was added and stirring was continued over night. Tetrabutylammonium iodide (34.5 mg, 0.093 mmol) was added and stirring was continued for another 48 h. To the reaction mixture was added saturated aq. NH4Cl and the mixture was extracted with MTBE (2×). The combined organic layers were washed with half-saturated aq. NaCl, dried with Na2SO4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 20:80) to provide the title compound as yellow solid.

情報源と証拠