Dimethylformamide → 6-Methoxy-2-methylpyridine-3-carbaldehyde

The 3-bromo-6-methoxy-2-methyl-pyridine (2.0 g, 9.9 mmol) obtained in (18-1) above was dissolved in toluene (dehydrated) (50 mL), and thereafter, n-butyllithium (6.4 mL, 10 mmol, 1.57 mmol/L hexane solution) was added dropwise to the solution at −78° C. in an argon atmosphere. The obtained mixture was stirred at the same temperature as described above for 30 minutes, and DMF (3.0 mL) was then added to the reaction solution. The obtained mixture was further stirred for 30 minutes. Thereafter, a saturated ammonium chloride water (100 mL) was slowly added to the reaction solution, and the temperature of the mixture was then increased to room temperature. The mixture was extracted with diethyl ether (100 mL) three times, and organic layers were gathered. The resultant was washed with water (100 mL) and saturated saline (100 mL), and was dried over anhydrous sodium sulfate and was then filtrated, followed by vacuum concentration. The obtained residue was purified by silica gel column chromatography (SiO2 30 g, hexane:ethyl acetate=98:2 to 90:10), so as to obtain 487 mg of 6-methoxy-2-methyl-3-pyridinecarboxaldehyde.

1. additionwas then added to the reaction solution
2. stirringThe obtained mixture was further stirred for 30 minutes
3. extractionThe mixture was extracted with diethyl ether (100 mL) three times, and organic layers
4. washThe resultant was washed with water (100 mL) and saturated saline (100 mL)
5. dry with materialwas dried over anhydrous sodium sulfate
6. filtrationwas then filtrated
7. concentrationfollowed by vacuum concentration
8. customThe obtained residue was purified by silica gel column chromatography (SiO2 30 g, hexane:ethyl acetate=98:2 to 90:10)

ORD record

ord-b9810b2dcc6c44ce8730d9602d7caba1

Source dataset

uspto-grants-2015_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09018238B2