Formaldehyde → CID 59418223

Participants

Reaction Steps

To a solution of 3-oxa-7,9-diaza-bicyclo[3.3.1]nonane-9-carboxylic acid benzyl ester (Compound X) (84 mg, 0.28 mmol) in MeOH (5 mL) was added paraformaldehyde (41 mg, 1.38 mmol) and NaBH4 (21 mg, 0.56 mmol). The reaction mixture was refluxed for 16 hours under argon atmosphere, and then quenched with sat. NaHCO3, then extracted with EtOAc (20 mL) three times. The combined organic layer was washed successively with sat. NH4Cl, NaHCO3 and brine, and then dried over Na2SO4. The solvent was concentrated under reduced pressure. The residue was dissolved in MeOH (20 mL). To the solution was added 10% Pd on carbon (20 mg). The mixture was stirred under one atmosphere pressure of hydrogen at room temperature. After the reaction was completed, the mixture was filtered and concentrated to give the crude 7-methyl-3-oxa-7,9-diaza-bicyclo[3.3.1]nonane (Compound Z) (32 mg, 81%) which was directly used for next step. MS: calc'd (MH+) 143, measured (MH+) 143.

Provenance & Evidence