反应详情

A solution of 7-oxo-5-tosyl-4,5,6,7-tetrahydro-thieno[3,2-c]pyridine (19.6 g; 0.064 mole; obtained in (b) above) and potassium tert-butoxide (28.6 g; 0.255 mole) in tert-butanol (300 ml) is refluxed for 2 hours under a nitrogen atmosphere. Evaporation of the solvent in vacuo leaves a residue which is taken up into 2N hydrochloric acid. The aqueous phase is extracted with ether, made basic by addition of concentrated ammonia, and evaporated to dryness. The residue is extracted four times with boiling ethyl acetate. The organic extracts are filtered through a silica bed and evaporated to dryness. The solid residue is recrystallized from ethanol-acetonitrile. Greyish crystals; M.P.=180° C.; Yield: 72%.

1. customEvaporation of the solvent in vacuo
2. customleaves a residue which
3. extractionThe aqueous phase is extracted with ether
4. additionmade basic by addition of concentrated ammonia
5. customevaporated to dryness
6. extractionThe residue is extracted four times with boiling ethyl acetate
7. filtrationThe organic extracts are filtered through a silica bed
8. customevaporated to dryness
9. customThe solid residue is recrystallized from ethanol-acetonitrile