tert-butyl 3,8-diazabicyclo[3.2.1]octane-3-carboxylate

201162-52-9

201162-53-0

The general procedure for the synthesis of tert-butyl 3,8-diazabicyclo[3.2.1]octane-3-carboxylate from tert-butyl 8-benzyl-3,8-diazabicyclo[3.2.1]octane-3-carboxylate was as follows: the product of Example 23A (0.62 g, 0.12 mmol) was dissolved in ethanol (10 mL) and palladium/carbon (Aldrich, 60 mg, 10 wt%) as a catalyst. The reaction was stirred at room temperature for 18 h under an atmosphere of hydrogen (balloon) at 1 atm. Upon completion of the reaction, the reaction mixture was filtered to remove the catalyst and the filtrate was concentrated under reduced pressure to remove the solvent. The resulting crude product was purified by silica gel column chromatography with an eluent ratio of 1% ammonia:9% methanol:90% dichloromethane to afford tert-butyl 3,8-diazabicyclo[3.2.1]octane-3-carboxylate, the target compound (0.44 g, 100% yield). Mass spectral analysis (DC1/NH3) showed m/z 213 (M + H)+.