Formaldehyde → 4-(5-Methoxy-3-pyridinyl)-6-methyl-6-azabicyclo[3.2.1]oct-3-ene

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Reaction Steps

A mixture of 4-(5-methoxy-3-pyridinyl)-6-azabicyclo[3.2.1]oct-3-ene (15 mg, 0.07 mmol), aqueous formaldehyde (37%, 0.25 mL) and 90% formic acid (1 mL) was heated at reflux for 1½ h. The mixture was concentrated under reduced pressure, and the remaining volatiles were removed by azeotropic evaporation with methanol (three times). The residue was made basic with dilute aqueous sodium hydroxide and extracted into dichloromethane. The extracts were dried over anhydrous sodium sulfate, filtered and concentrated. The crude product was chromatographed on a silica gel column, eluting with 90:10:1 dichloromethane/methanol/concentrated ammonium hydroxide. Concentration of selected fractions gave the product as an oil (9.0 mg, 56%).

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