Sodium Bicarbonate → 1-Methyl-7-(3-pyridyl)-1,7-diazaspiro[4.4]nonane

Participants

Reaction Steps

7-(3-Pyridyl)-1,7-diazaspiro[4.4]nonane (30 mg, 0.15 mmol) was dissolved in 98% formic acid (0.5 mL) and formaldehyde (1 mL, 28% aqueous solution). The reaction mixture was heated to reflux for 8 h. The reaction mixture was cooled to room temperature, basified with saturated aqueous sodium bicarbonate to pH 9-10 and extracted with chloroform (4×3 mL). The combined chloroform extracts were dried (K2CO3), filtered and concentrated on a rotary evaporator to afford 30 mg of the desired compound (93.6%) as a light brown liquid.

Provenance & Evidence