Acetonitrile → 3,3-Dimethylhexahydroindolizin-7(1H)-one

Temperature

60 °C

3,4-Dihydro-2,2-diemthyl-2H-pyrrole (900 mg, 9.3 mmol) was added to acetonitrile (90 ml) in a 250 ml round bottom flask, fitted with water condenser. ZnCl2 (0.5M) in THF (23 ml, 11.6 mmol) was added to the solution and warmed to 60° C. 2-(Trimethylsiloxy)-1,3-butadiene (2.6 g, mmol, 18.4 mmol) was added to the mixture and heated at 90° C. overnight. The solution was cooled to room temperature and diluted with dichloromethane (90 ml) and 1N HCl (90 ml). The two layers were separated, the aqueous layer was basified with NH3 (28%) in H2O, and extracted with dichloromethane. The organic layer was washed with brine and dried with Na2SO4. Solid was removed by filtration and mother liquor was concentrated in vacuo to give 250 mg brown color oil. This oil was further purified by column chromatography (100% ethyl acetate to 95% ethyl acetate: 5% methanol) to give a light yellow oil (170 mg, 11% yield).

1. customfitted with water condenser
2. temperatureheated at 90° C. overnight
3. temperatureThe solution was cooled to room temperature
4. customThe two layers were separated
5. extractionextracted with dichloromethane
6. washThe organic layer was washed with brine
7. dry with materialdried with Na2SO4
8. customSolid was removed by filtration and mother liquor
9. concentrationwas concentrated in vacuo
10. customto give 250 mg brown color oil
11. customThis oil was further purified by column chromatography (100% ethyl acetate to 95% ethyl acetate: 5% methanol)

ORD record

ord-9ca44167dbb74e2e85570839775ba873

Source dataset

uspto-grants-2015_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09169249B2