Potassium Carbonate → 1251017-66-9

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A solution of 3-(tert-butoxycarbonyl)-6-(trifluoromethylcarbonyl)-3,6-diazabicyclo[3.1.1]heptane (4) (8.5 g, 28.9 mmol) and potassium carbonate (30.7 g, 2 eq, 57.8 mmol) in methanol (150 mL) was heated at 70° C. for 3 h. The solution was cooled to ambient temperature and the solvent was removed in vacuo. The crude material was dissolved in a 1:1 solution of methylene chloride:methanol and filtered to give 3-(tert-butoxycarbonyl)-3,6-diazabicyclo[3.1.1]heptane (5) (4.5 g, 79% yield) as an off-white solid.

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