4-Methylpyridine → HCID 18446302, compound

Temperature

-40 °C

A solution of 19.5 ml (200 mmol) of 4-picoline in tetrahydrofuran (120 ml) was cooled to −78° C. Lithium diisopropylamide (2 M heptane, tetrahydrofuran, ethylbenzene solution) (200 ml) was added dropwise to the cooled solution over a period of 20 min. The mixture was then stirred at -40° C. for 20 min and was cooled to −78° C. Cyclopropylbromide (16.0 ml, 200 mmol) was added dropwise to the reaction solution over a period of 25 min, and the mixture was stirred at −78° C. for one hr. The reaction solution was then added to 300 ml of a saturated aqueous ammonium chloride solution, and the mixture was satisfactorily washed with 100 ml of water. The solution was extracted twice with 200 ml of ethyl acetate, and the extract was dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated, and the residue was distilled under the reduced pressure (8 mmHg, 86 to 87° C.). The distillation residue was purified by column chromatography on silica gel (hexane:ethyl acetate=70:30) to give 17.6 g (yield 66%) of the title compound.

1. temperaturewas cooled to −78° C
2. stirringthe mixture was stirred at −78° C. for one hr
3. washthe mixture was satisfactorily washed with 100 ml of water
4. extractionThe solution was extracted twice with 200 ml of ethyl acetate
5. dry with materialthe extract was dried over anhydrous sodium sulfate
6. filtrationAfter filtration
7. concentrationthe filtrate was concentrated
8. distillationthe residue was distilled under the reduced pressure (8 mmHg, 86 to 87° C.)
9. distillationThe distillation residue was purified by column chromatography on silica gel (hexane:ethyl acetate=70:30)

ORD record

ord-b064d8f8eddb4023b3b6fe00f9ab53f9

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07879808B2