Hydrochloric Acid → N,5-Dimethyl-2,3,4,9-tetrahydro-1H-carbazol-3-amine

Participants

Reaction Steps

A solution of 15 g. of 4-methylaminocyclohexanone and 18.4 g. of 3-methylhydrazine hydrochloride in 200 ml. of absolute ethyl alcohol and 50 ml. of 4-N hydrogen chloride in absolute ethyl alcohol was heated under reflux for six hours, cooled, and filtered to give 12.3 g. of solids which were slurried in 50 ml. of water. The slurry was cooled, the solids were collected by filtration, suspended in ether-chloroform, and the suspension was treated with dilute potassium hydroxide. The ether-chloroform extract was evaporated to dryness under pressure to give 7.6 g. of 3-(methylamino)-7-methyl-1,2,3,4-tetrahydrocarbazole, m.p. 163°-166° C. The alcoholic reaction mixture filtrate was evaporated to dryness under reduced pressure, the residue was boiled in isopropyl alcohol, and the insoluble material was collected by filtration, dissolved in water and the resulting solution was made alkaline with dilute potassium hydroxide. The resulting solids were collected by filtration to give, after recrystallization from ethyl acetate, 3.6 g. of 3-(methylamino)-5-methyl-1,2,3,4-tetrahydrocarbazole, m.p. 187°-190° C., which contained about 6% of the 7-methyl isomer as determined by gas chromatographic analysis.

Provenance & Evidence