Methyl iodide → 201609-39-4

Temperature

-55 °C

1-Benzyl-4-phenyl-1,2,3,6-tetrahydropyridine (160 mg, 0.64 mmol) was dissolved in anhydrous tetrahydrofuran (2 ml) to which was subsequently added dropwise n-butyl lithium hexane solution (0.64 mmol) at −10 to −20° C. in an atmosphere of argon, followed by 15 minutes of stirring. After cooling the reaction solution to −50 to −60° C., iodomethane (0.13 ml, 2.1 mmol) was added dropwise thereto and then the solution was stirred for 2 hours while gradually increasing the temperature to −20° C. After adding saturated brine to the reaction solution, the reaction product was extracted with ethyl acetate, and the resulting extract was washed with water and saturated brine and dried with anhydrous sodium sulfate. Then the solvent was evaporated under a reduced pressure. The thus obtained residue was dissolved in methanol (2 ml), and the solution was mixed with palladium-carbon (40 mg) and stirred at room temperature for 38 hours in an atmosphere of hydrogen. The reaction solution was filtered, the resulting mother liquor was mixed with hydrochloric acid-saturated methanol and then the solvent was evaporated under a reduced pressure to obtain crystals which were then washed with a small amount of ethyl acetate to obtain 83 mg of the title compound (0.28 mmol, 43% in yield).

1. stirringthe solution was stirred for 2 hours
2. temperaturewhile gradually increasing the temperature to −20° C
3. extractionthe reaction product was extracted with ethyl acetate
4. extractionthe resulting extract
5. washwas washed with water and saturated brine
6. dry with materialdried with anhydrous sodium sulfate
7. customThen the solvent was evaporated under a reduced pressure
8. dissolutionThe thus obtained residue was dissolved in methanol (2 ml)
9. additionthe solution was mixed with palladium-carbon (40 mg)
10. stirringstirred at room temperature for 38 hours in an atmosphere of hydrogen
11. filtrationThe reaction solution was filtered
12. additionthe resulting mother liquor was mixed with hydrochloric acid-saturated methanol
13. customthe solvent was evaporated under a reduced pressure
14. customto obtain crystals which
15. washwere then washed with a small amount of ethyl acetate

ORD record

ord-32097896233c430b8928b072cebd012f

Source dataset

uspto-grants-2002_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06355642B1