Formaldehyde → HCID 22620531, compound

Participants

Reaction Steps

A 37% aqueous formaldehyde solution (1.50 g, 18.4 mmol), sodium cyanotrihydroborate (0.12 g, 18.4 mmol) and acetic acid (0.1 ml) were added to a solution in acetonitrile (8 ml) of the ethyl 2,3-dihydro-1H-benz[b]azepine-4-carboxylate (0.40 g, 1.84 mmol) synthesized in Reference Example 5. After stirring at room temperature for 2 hours, the reaction mixture was poured into a 1N aqueous sodium hydroxide solution and extracted twice with diethyl ether. The extract solution was washed twice with a 5% aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate/n-hexane=4/96) to obtain 0.40 g of ethyl 1-methyl-2,3-dihydro-1H-benz[b]azepine-4-carboxylate.

Provenance & Evidence