Lithium borohydride → Phenanthro[1,2-b]furan-2-methanol

Participants

Reaction Steps

To a RB flask equipped with magentic stirring bar, reflux condenser, N2 inlet tube with bubbler was added ethyl phenanthro(1,2-b]furan-2-carboxylate (H. G. Pars Pharmaceutical Laboratories, Inc., 7.9 g, 27.2 mmol), lithium borohydride (Aldrich, 0.65 g, 30 mmol) and dry THG (400 mL). The mixture was stirred at reflux for 6 h and then poured into H2O (1 L). The reaction mixture was acidified with 1N HCl and the resulting white solid was filtered, washed with additional H2O (1500 mL) then dissolved in CH2Cl2 (500 mL), dried (Na2SO4), filtered, concentrated to 200 mL and diluted to 500 mL with hexane. The resulting material was filtered, washed with hexane (100 mL) and placed in a vacuum oven overnight. A total of 6.1 g (90.1%) of phenanthro[1,2-b]furan-2-methanol, mp 125°-126° was obtained (C, H).

Provenance & Evidence