反应详情

A solution of 4-pyridine carboxaldehyde, O-methyloxime methiodide (32.78 g, 118 mmol) in 150 ml 50% aqueous methanol was added dropwise to a solution of sodium borohydride (7.79 g, 206 mmol) in 150 ml of aqueous 50% methanol keeping the temperature 0° C. ±5° C. After the solution was stirred one hour, some of the inorganic salts were removed by filtration and the filtrate was concentrated to a mass of oily crystals in vacuo. A portion (4.5 g) of this material was partially dissolved in boiling ethyl ether, filtered, and the filtrate treated with hydrogen chloride to give 1,2,3,6-tetrahydro-1-methyl-4-pyridine carboxaldehyde, O-methyloxime, hydrochloride (2.35 g), mp 212°-214° C.

1. customsome of the inorganic salts were removed by filtration
2. concentrationthe filtrate was concentrated to a mass of oily crystals in vacuo
3. dissolutionA portion (4.5 g) of this material was partially dissolved
4. filtrationfiltered
5. additionthe filtrate treated with hydrogen chloride