tert-Butyl 4-(1-methyl-1H-imidazole-5-carbonyl)piperidine-1-carboxylate → 1-(4-(Hydroxy(1-methyl-1H-imidazol-5-yl)(3-phenyl-2,4-bis(trifluoromethyl)quinolin-6-yl)methyl)piperidin-1-yl)ethanone

Participants

Reaction Steps

A ˜−70° C. solution of 6-iodo-3-phenyl-2,4-bis(trifluoromethyl)quinoline (150 mg, 0.322 mmol; Intermediate 8, step d) in THF (0.322 mL) was treated with iPrMgCl (2.06 M in THF; 0.156 mL, 0.322 mmol) dropwise via syringe under argon over the course of 30 sec to provide a light amber solution that became a yellow opaque slurry within 2 min. After 8 additional min the reaction was removed from the cold bath and stirred on a room temperature water bath for 10 min, at which point solid 1-(4-(1-methyl-1H-imidazole-5-carbonyl)piperidin-1-yl)ethanone (90.9 mg, 0.386 mmol; Intermediate 53, step c) was added in one portion and the reaction quickly evacuated and flushed with argon four times. After 5 min, additional THF (2.6 mL) was added to aid the dissolution of the ketone, and the reaction became an opaque easily stirred tan slurry within 30 min. After 110 min, the reaction was quenched with D2O (0.2 mL) and partitioned with 5 M NH4Cl (1 mL) and heptane (1 mL), and the organic layer was dried (Na2SO4), filtered, and concentrated. The residue was flash chromatographed using a DCM to 9:1 DCM/MeOH gradient to provide the title compound as a white powder.

Provenance & Evidence