Sodium hydride → HCID 22222518, compound

Participants

Reaction Steps

In 3 ml dimethyl formamide was suspended 18.8 mg of 60% sodium hydride. The mixture of 2,3-dimethyl-4-hydroxy-5-trifluoromethyl-6-fluoroquinoline with 2,3-dimethyl-4-hydroxy-6-fluoro-7-trifluoromethylquinoline (starting material 1) (100 mg) was suspended in 3 ml of dimethyl formamide, and this suspension was added dropwise to the above suspension under ice cooling. After stirring for one hr, 40.8 mg of cyclopropanecarbonyl chloride (starting material 2) was added thereto, and the mixture was stirred at room temperature for 15 hr. The reaction solution was poured into water, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with a saturated aqueous sodium hydrogencarbonate solution and saturated brine and was then dried over anhydrous sodium sulfate. The solvent was then removed by evaporation under the reduced pressure. The crude product thus obtained was purified on a silica gel packed column (Varian) (20 g; elution solvent=n-hexane-ethyl acetate (40:1) to (20:1)) to give 27.9 mg of 2,3-dimethyl-4-cyclopropanecarbonyloxy-5-trifluoromethyl-6-fluoroquinoline (compound 61) and 51.3 mg of 2,3-dimethyl-4-cyclopropanecarbonyloxy-6-fluoro-7-trifluoro -methylquinoline (compound 63). 1H-NMR data are shown in Table 3.

Provenance & Evidence