Ammonia → 1-Azabicyclo[3.3.1]nonane-5-carboxamide

Participants

Reaction Conditions

Reaction Steps

A solution of 1-azabicyclo[3.3.1]nonane-5-carboxylic acid methyl ester (1.83 g, 10 mmol) in ammonia (50 mL) and methanol (20 mL) was sealed in a bomb and heated at 120°-130° C. for 36 hours (gas chromatography indicated that the reaction was incomplete). Three drops of 25% sodium methoxide/methanol were added, and the mixture was heated at 130° C. for 21 hours and at 150° C. for 72 hours, at which time the reaction was essentially complete. The solution was concentrated in vacuo and the residue was partitioned between 1.25N sodium carbonate (50 mL) and methylene chloride (75 mL). The organic layer was separated and the aqueous solution was extracted with methylene chloride (2×40 mL). The combined organic layers were dried (Na2SO4), concentrated in vacuo, and recrystallized from acetonitrile to afford 0.64 g (38%) of pale brown solid; mp 172.5°-175.0° C.

Provenance & Evidence