Hydrochloric Acid → 1-Chloro-3-propyl-2-hexanone

Temperature

0 °C

To 2-propylpentanoic acid (156.6 μl, 1.00 mmol) dissolved in anhydrous dichloromethane (2 mL) was added DMF (3 μL, 4 mole %), and the solution was cooled to 0° C. under a nitrogen atmosphere. To the solution was added oxalyl chloride (94.3 μL, 1.08 mmol) dropwise over a few minutes. The reaction was stirred 18 hours while warming to ambient temperature. The mixture was cooled to 0° C. and excess ~0.3M ethereal diazomethane solution was added. The reaction mixture was stirred 18 hours while warming to ambient temperature. The reaction mixture was washed with 1M aqueous sodium carbonate solution (30 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was dissolved in ether (2mL) and cooled to 0° C. under a nitrogen atmosphere. Hydrogen chloride as a 4N solution in dioxane (275 μL, 1.10 mmol) was added dropwise over a few minutes. The reaction was stirred 18 hours while warming to ambient temperature. The reaction mixture was concentrated under reduced pressure and the residual oil was used in the next step without further purification.

1. temperaturewhile warming to ambient temperature
2. temperatureThe mixture was cooled to 0° C.
3. stirringThe reaction mixture was stirred 18 hours
4. temperaturewhile warming to ambient temperature
5. washThe reaction mixture was washed with 1M aqueous sodium carbonate solution (30 mL)
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. dissolutionThe residue was dissolved in ether (2mL)
10. temperaturecooled to 0° C. under a nitrogen atmosphere
11. stirringThe reaction was stirred 18 hours
12. temperaturewhile warming to ambient temperature
13. concentrationThe reaction mixture was concentrated under reduced pressure
14. customthe residual oil was used in the next step without further purification

ORD record

ord-9216403abe2a471cb8b491c2ec69c28c

Source dataset

uspto-grants-1998_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05731434