Hydrochloric Acid → Spiro[benzo[c]thiophene-1(3H),4'-piperidine]-2,2-dioxide hydrochloride

Participants

Reaction Steps

170 mg (0.5 mmole) of 1′-t-butoxycarbonylspiro[benzo[c]thiophene-1(3H),4′-piperidine]-2,2-dioxide [prepared as described in step (a) above] were dissolved in 3 ml of methylene chloride, and 1 ml of a 4 N solution of hydrogen chloride in dioxane was added, whilst ice-cooling. The mixture was then stirred, whilst ice-cooling, for 1 hour, after which the crystals which deposited were collected by filtration, to give 131 mg (yield 95%) of the title compound as white crystals.

Provenance & Evidence