Dimethylformamide → HCID 23114767, compound

Under an argon atmosphere, n-butyl lithium (a 1.58M hexane solution, 0.33 ml, 0.520 mmol) was added to a toluene (5 ml) solution of 2-bromo-5-chloro-4-[(4-chlorophenylthio)(2,5-difluorophenyl)methyl]pyridine (200 mg, 0.434 mmol) at −78° C. The resulting mixture was stirred for 2 hours. To the reaction mixture was added dropwise dimethylformamide (44 μl, 0.564 mmol). The reaction mixture was stirred for 1 hour. To the reaction mixture were added methanol (5 ml) and sodium borohydride (33 mg, 0.868 mmol). The temperature of the resulting mixture was raised to room temperature, followed by stirring for 2 hours. Water was added to the reaction mixture and then, the resulting mixture was extracted with ethyl acetate. The extract was washed with brine. The organic layer thus obtained was dried over magnesium sulfate, and concentrated under reduced pressure. The residue thus obtained was subjected to flash silica gel column chromatography. The fraction obtained from the hexane:ethyl acetate=2:1 eluate was concentrated under reduced pressure to give the title compound (142 mg, 0.344 mmol, 80%) as a colorless amorphous substance.

1. stirringThe reaction mixture was stirred for 1 hour
2. stirringby stirring for 2 hours
3. extractionthe resulting mixture was extracted with ethyl acetate
4. washThe extract was washed with brine
5. customThe organic layer thus obtained
6. dry with materialwas dried over magnesium sulfate
7. concentrationconcentrated under reduced pressure
8. customThe residue thus obtained
9. concentrationethyl acetate=2:1 eluate was concentrated under reduced pressure

ORD record

ord-30f921220cef47a48ed3888bd9f7cdd6

Source dataset

uspto-grants-2011_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07932271B2