Methanol → 5,6,7,8-Tetrahydro-4H-thieno[3,2-B]azepine

Temperature

0 °C

To a mixture of 21.2 g of 5,6,7,8-tetra-hydro-4H-thieno[3,2-b]azepin-5-one in 100 ml of tetrahydrofuran under argon, chilled to 0° C. is added 25.2 ml of a 10.0 molar solution of borane-dimethylsulfide in tetrahydrofuran. The solution is stirred at room temperature for 16 hours and is refluxed for 5 hours. The mixture is cooled to room temperature and 85 ml of methanol added dropwise (exotherm). The solvent is removed and 100 ml of methanol is added (2 times) and after each addition the solvent is removed. To the residual solid (dried under vacuum) is added 126 ml of 2N NaOH and the mixture refluxed 3 hours. The mixture is chilled (2 hours) and extracted with dichloromethane. The extract is dried (Na2SO4) and the solvent removed to give 15.4 g of brown solid, m.p. 55°-57° C. A sample (3 g) is sublimed to give 2.6 g of crystals, m.p. 64°-65° C.

1. temperatureis refluxed for 5 hours
2. temperatureThe mixture is cooled to room temperature
3. customThe solvent is removed
4. addition100 ml of methanol is added (2 times)
5. additionafter each addition the solvent
6. customis removed
7. customTo the residual solid (dried under vacuum)
8. additionis added 126 ml of 2N NaOH
9. temperaturethe mixture refluxed 3 hours
10. temperatureThe mixture is chilled (2 hours)
11. extractionextracted with dichloromethane
12. dry with materialThe extract is dried (Na2SO4)
13. customthe solvent removed

ORD record

ord-5764dffb46364cd88b8e70644ca45447

Source dataset

uspto-grants-1998_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05719278