Dimethyl Sulfoxide → 3-(Pyridin-2-YL)propanal

A solution of 4.5 mL (9 mmol, 1.2 eq.) of oxalyl chloride (2.0 M solution in dichloromethane) was diluted with 15 mL of dichloromethane. To this solution was added a solution of 1.2 mL (17.5 mmol, 2.4 eq.) of DMSO in 3 mL of dichloromethane at −60° C. and the mixture was stirred for 10 minutes at this temperature. To this mixture was added a solution of 1 g (7.3 mmol) of 4-pyridinepropanol in 7 mL of dichloromethane at −60° C. The resulting mixture was stirred at −60° C. for 15 minutes, then 5.0 mL (36.5 mmol, 5.0 eq.) of triethylamine was added at this temperature. The cooling bath was removed and the reaction mixture was allowed to warm to room temperature and was quenched with water. The organic layer was separated and the aqueous layer was extracted three times with dichloromethane. The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash chromatography providing 3-pyridin-2-ylpropionaldehyde as a brown oil. Yield: 769 mg (78%).

1. stirringThe resulting mixture was stirred at −60° C. for 15 minutes
2. customThe cooling bath was removed
3. customwas quenched with water
4. customThe organic layer was separated
5. extractionthe aqueous layer was extracted three times with dichloromethane
6. dry with materialThe combined organic layers were dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified by flash chromatography

ORD record

ord-723c359efb394a5d80f201e7088a38a8

Source dataset

uspto-grants-2005_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06903215B2