Hydrochloric Acid → 1-Azabicyclo[3.2.1]octane-5-carboxamide

Ethyl 1-azabicyclo[3.2.1]oct-5-ylcarboxylate (E7, Example 7 hereinafter, 9.6 g, 0.053 mole) was treated with 8M hydrochloric acid (130 ml) and heated under reflux for 18h. The solution was concentrated in vacuo to give a white solid, which was treated with thionyl chloride (80 ml) and heated under reflux for 6h. The reaction mixture was concentrated in vacuo to leave a red semi-solid, which was suspended in dichloromethane (120 ml), cooled in an ice bath and treated with an excess of ammonia/dichloromethane solution. The mixture was stirred at room temperature for 1h, then treated with saturated potassium carbonate solution. The organic layer was separated and the aqueous was extracted with chloroform (3×70 ml). All the organics were combined, then dried (Na2SO4) and concentrated in vacuo to give the title compound (D20) as a brown solid (6.2 g, 76%), which was used without further purification.

1. temperatureheated
2. temperatureunder reflux for 18h
3. concentrationThe solution was concentrated in vacuo
4. customto give a white solid, which
5. temperatureheated
6. temperatureunder reflux for 6h
7. concentrationThe reaction mixture was concentrated in vacuo
8. customto leave a red semi-solid, which
9. temperaturecooled in an ice bath
10. customThe organic layer was separated
11. extractionthe aqueous was extracted with chloroform (3×70 ml)
12. dry with materialdried (Na2SO4)
13. concentrationconcentrated in vacuo

ORD record

ord-caa2793e5f54461b9a2727e7a6860112

Source dataset

uspto-grants-1992_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05132316