Sulfuric Acid → 2-(3-Methyl-4-chloro-pyridin-2-yl)-2-cyclopropyl-acetaldehyde

1.02 g of 2-(4-chloro-3-methoxy-2-pyridyl)-2-cyclopropyl-1-methoxyethene (XI) was dissolved in 10 ml of THF and 10 ml of dilute sulfuric acid was added to the resulting mixture and the resulting mixture was concentrated at 50° C. under reduced pressure. The resulting mixture was poured into water and neutralized with saturated sodium bicarbonate solution, and thereafter, extracted with chloroform. The resulting organic layer was washed with saturated salt water, and thereafter, dried over anhydrous sodium sulfate and the solvent was distilled off under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent; hexane:ethyl acetate=4:1) to obtain 0.81 g of 2-(4-chloro-3-methyl-2-pyridyl)-2-cyclopropylethanal (XII).

1. concentrationthe resulting mixture was concentrated at 50° C. under reduced pressure
2. additionThe resulting mixture was poured into water and neutralized with saturated sodium bicarbonate solution
3. extractionextracted with chloroform
4. washThe resulting organic layer was washed with saturated salt water
5. dry with materialdried over anhydrous sodium sulfate
6. distillationthe solvent was distilled off under reduced pressure
7. customThe resulting residue was purified by silica gel column chromatography (eluent; hexane:ethyl acetate=4:1)

ORD record

ord-602a27f49da741528ed377148d37d08c

Source dataset

uspto-grants-2003_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06525066B2