Methyl iodide → HCID 14510255, compound

Temperature

65 °C

To a suspension of 80% sodium hydride (1.22 g, 41 mmol) in anhydrous dimethylformamide (90 mL), was added dropwise a solution of N-(3,5-difluorophenyl)-2-pyridinecarboxamide, prepared by a process of Example 1, difluorophenyl)-2-pyridinecarboxamide, prepared by the process of Example 1, Step 1 (8.71 g, 37 mmol) in dimethylformamide (30 mL). The reaction mixture was warmed to 65° C. for 1 hour and then treated with iodomethane (2.60 mL, 42 mmol) at room temperature. After 2.5 hours the reaction mixture was poured into water (500 mL) and extracted with ethyl acetate (2×300 mL). The combined organic layers were washed with 75% brine, dried, preabsorbed onto silica gel, and flash chromatographed (300 g, elution with 40% ethyl acetate in petroleum ether) to yield pure N-(3,5-difluorophenyl)-N-methyl-2-pyridinecarboxamide (5.16 g, 21 mmol, 56%, m.p. 102°-104° C.), which was reacted with Lawesson's reagent (4.36 g, 11 mmol) in anhydrous toluene (65 mL) at reflux temperature for 1.5 hours. The toluene was evaporated and the residue was dissolved in dichloromethane, preadsorbed onto silica gel, flash chromatographed (300 g, elution with 10% ethyl acetate in petroleum ether), and recrystallized from ethyl acetate in petroleum ether to afford a yellow solid (2.36 g, 24%), m.p. 131°-134° C.

1. extractionextracted with ethyl acetate (2×300 mL)
2. washThe combined organic layers were washed with 75% brine
3. customdried
4. custompreabsorbed onto silica gel, and flash
5. customchromatographed
6. wash(300 g, elution with 40% ethyl acetate in petroleum ether)

ORD record

ord-3b3e091e859b4067ab72cd6b6672908d

Source dataset

uspto-grants-1990_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04950762