4-Methylquinoline → 2-(1-Fluorocyclopropyl)-4-(4-fluorophenyl)-4-methyl-1-quinolin-4-ylpentan-2-ol

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-methylquinoline (69 mg, 0.482 mmol) in THF cooled on dry ice/acetone was added 0.4 mL of lithium dilsopropylamide (1.5 M in hexanes). The mixture was placed in a cold bath at −20° C. to −30° C. for 15 minutes and then cooled to −78° C. 1-(1-Fluorocyclopropyl)-3-(4-fluorophenyl)-3-methylbutan-1-one (49 mg, 0.206 mmol) was added dropwise as a solution in 0.5 mL of THF. The cold bath was then removed and the mixture stirred for 1 hour. The reaction was quenched by addition of 0.5 mL of water and diluted with ethyl acetate. The organic phase was separated, washed with water, dried, filtered, and the solvent evaporated in vacuo. Fractionation of the residue by preparative layer chromatography (developer: ethyl acetate-hexanes (2:1)) gave the title compound (0.019 g, 24% yield) (slightly less polar than lepidine) as an oil that crystallized on standing in hexanes, m.p. 152° C.-155° C.

Provenance & Evidence