Hydrochloric Acid → (1S,4R)-1,2,3,4-tetrahydro-4-(methylamino)-1-naphthalenol

Participants

Reaction Conditions

Reaction Steps

To a solution of 1,2,3,4-tetrahydro-1,4-epoxynaphthalene (2.92 g, 20 mmol) and triethylamine (0.3 mL, 2 mmol) in 40 mL of dichloromethane at 0° C. was added 9-bromo-9-borabicyclo[3.3.1]nonane (1 M solution in tetrahydrofuran, 30 mL, 30 mmol). The reaction mixture was stirred at 0° C. for 20 minutes, and a 2 M solution of methylamine in tetrahydrofuran (40 mL) was then added, forming a white precipitate. The reaction mixture was stirred at room temperature for 16 h, poured into 100 mL of 1 M aqueous hydrochloric acid, and filtered. The filtered aqueous layer was washed with dichloromethane, basified with NaOH pellets to pH 13, and then extracted with dichloromethane. The extract was washed with brine, dried over magnesium sulfate and evaporated in vacuo to give a gummy yellow solid. The solid was slurried in diethyl ether, filtered, washed with diethyl ether and air dried to give 2.15 g of the title compounds as white powder.

Provenance & Evidence