反应详情

(a) A solution of 32 mg (0.06 mmol) of methyl rac-1',2',3',4',5',5a',6',11',11a',12'-decahydro-6',11'-diacetoxy-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylate in 2 ml of dry xylene was stirred and heated under reflux under an atmosphere of nitrogen for 20 hours. The solution was then evaporated to dryness to give 24 mg (97%) of methyl rac-1',2',3',4',5',12'-hexahydro-5',12'-dioxospiro[1,3-dithiolane-2,4'-naphthacene]-2'-carboxylate in the form of a bright yellow solid of melting point 216° C.

1. temperatureheated
2. temperatureunder reflux under an atmosphere of nitrogen for 20 hours
3. customThe solution was then evaporated to dryness