Thionyl Chloride → 6-[(4-Fluorophenyl)oxy]-3-pyridinecarbonyl chloride

Participants

Reaction Steps

6-[(4-Fluorophenyl)oxy]-3-pyridinecarboxylic acid (D14) (0.032 g, 0.14 mmol) was solubilised in dry dioxane (2 mL). Thionyl chloride (0.081 mg, 0.14 mmol) was added drop-wise and the reaction mixture heated at reflux for 1.25 h. The reaction mixture was concentrated, and then re-concentrated from DCM to give 6-[(4-fluorophenyl)oxy]-3-pyridinecarbonyl chloride which was used directly in step 2 Step 2: 1,1-Dimethylethyl (2S)-2-methyl-4-{[4-methyl-6-(methylamino)-3-pyridinyl]methyl}-1-piperazinecarboxylate (D101) (0.038 g, 0.11 mmol) was dissolved in dry DCM (2 mL). Triethylamine (0.016 g, 0.16 mmol) was added dropwise and after 5 minutes a solution of the acid chloride from step 1 in dry DCM (2 mL) was added dropwise. The reaction mixture was then left stirring under argon at room temperature overnight. Saturated aqueous NaHCO3 (15 mL) was added and the aqueous layer extracted with DCM (3×5 mL). The organic extracts were dried (Na2SO4) and the crude product was purified by column chromatography. Elution with a 0-100% EtOAc/petroleum ether gradient gave the title compound as a colourless oil (0.026 g). MS (ES): MH+ 550.4

Provenance & Evidence