1,2-Dichloroethane → (S)-3,5-dichloro-4-(2-(2-(6-chloronicotinoyloxy)acetoxy)-2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)ethyl)pyridine 1-oxide

Participants

Reaction Steps

To a mixture of (S)-3,5-dichloro-4-(2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)-2-(2-hydroxyacetoxy)ethyl)pyridine 1-oxide (See Scheme 21, step 6-9) (200 mg, 0.418 mmol), 6-chloronicotinic acid (72.5 mg, 0.460 mmol) and EDC (240 mg, 1.255 mmol) in dry DCM (10 ml), DMAP (51.1 mg, 0.418 mmol) was added, and stirring was continued for a week-end at room temperature. The solvent was evaporated; the residue was portioned between sat. sol. NaHCO3 and ethyl acetate, the organic phase was washed with brine, dried over sodium sulfate and evaporated, the residue was purified by flash chromatography on silica gel (eluent: DCM/MeOH/32% NH4OH 98/2/0.2) and (S)-3,5-dichloro-4-(2-(2-(6-chloronicotinoyloxy)acetoxy)-2-(3-(cyclopropylmethoxy)-4-(difluoromethoxy)phenyl)ethyl)pyridine 1-oxide was obtained as a white solid (202 mg, 0.327 mmol, 78% yield, MS/ESI+ 617.2 [MH]+).

Provenance & Evidence