Hydrochloric Acid → 2,2-Difluoro-7,8,9,10-tetrahydro-6H-[1,3]dioxolo[4,5-g]pyrido[4,3-b]indole

Participants

Reaction Conditions

Reaction Steps

The (2,2-difluoro-benzo[1,3]dioxol-4-yl)-hydrazine (753 mg, 4.00 mmol) and 4-piperidone hydrochloride (543 mg, 4.00 mmol) in ethanol (10 mL) were heated to reflux for 45 min. The 4M HCl in dioxane (2 mL) was added and heating continued for 2 h. A sample was removed and after bubbling HCl gas briefly was heated in the microwave to 110° C. for 10 min. The rest of the material was processed in 5 batches and the combined black reactions filtered, washed with a little water and then precipitation with Et2O:Hexane 1:2 (c.f. 10 mL) before drying the resulting grey solid (147 mg, 13% yield)

Provenance & Evidence