Methyl iodide → 3-Bromo-4-methyl-5-(trifluoromethyl)pyridine

Temperature

-10 °C

n-Butyl Lithium (1.9 mL, 3.044 mmol) was added to a solution of DIPA (335.7 mg, 3.318 mmol) in THF (6 mL) at -78° C. The reaction mixture was stirred at -10° C. for 10 minutes. This was followed by the addition of 3-bromo-5-trifluoromethyl-pyridine (500 mg, 2.212 mmol) in THF (3 mL) at -100° C. The reaction mixture was stirred for a further 15 minutes at -90° C. and was followed by the addition of methyl iodide (557.0 mg, 3.924 mmol) in THF (2 mL) at -78° C. with stirring over a period of 30 minutes. The reaction was monitored by TLC (5% ethyl acetate in hexane). The reaction mixture was quenched with aqueous NaHCO3 solution and extracted with ethyl acetate (100 mL). The organic layer was dried over Na2SO4 and concentrated. Purification by column chromatography on silica gel (2% ethylacetate in hexane) afforded 95 mg of the product (17.92% yield). LCMS: m/z=239.8 (M+1)

1. stirringThe reaction mixture was stirred for a further 15 minutes at -90° C.
2. stirringwith stirring over a period of 30 minutes
3. customThe reaction mixture was quenched with aqueous NaHCO3 solution
4. extractionextracted with ethyl acetate (100 mL)
5. dry with materialThe organic layer was dried over Na2SO4
6. concentrationconcentrated
7. customPurification by column chromatography on silica gel (2% ethylacetate in hexane)

ORD record

ord-2daa4fea9e3f48028177dd6fe2def8e0

Source dataset

uspto-grants-2012_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08263635B2