Hydrochloric Acid → 3,3-Dimethyl-1lambda6,2-thiazolidine-1,1-dione

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Reaction Steps

11.58 g of phenyl 3-amino-3-methylbutane-1-sulfonate and 5.34 g of KOH were boiled under reflux in 240 ml of THF/95 ml of water for 7 hours. Then a further 2.7 g of KOH, 50 ml of water and 120 ml of THF were added, and the mixture was again boiled under reflux for 7 hour. Then a further 5.34 g of KOH were added, and the mixture was again boiled under reflux for 3 hours. It was allowed to cool and then 300 ml of a 2N aqueous HCl solution were added, and the mixture was extracted 5 times with 250 ml of EA each time. After drying over Na2SO4, the solvent was removed in vacuo. Chromatography on silica gel with EA/HEP 1:1 afforded 3.82 g of white crystals, mp 72° C.

Provenance & Evidence