1-(Aminomethyl)-1,2,3,4-tetrahydronaphthalen-1-ol → 6,7,8,9-tetrahydro-5H-benzo(7)annulen-6-one

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Reaction Steps

To a solution of 1-aminomethyl-1-hydroxy-1,2,3,4-tetrahydronaphthalene (19 g) in 10% acetic acid in water (380 ml) was dropwise added sodium nitrite (11 g) in water (56 ml) at 5° C., and the mixture was stirred at the same temperature for 2 hours. The resulting mixture was diluted with ethyl acetate and separated. The organic layer was successively washed with water, saturated aqueous sodium hydrogencarbonate and brine, dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was purified. by column chromatography on silica gel (hexane-ethyl acetate) to give 5,7,8,9-tetrahydrobenzocyclohepten-6-one (9.3 g).

Provenance & Evidence