Hydrochloric Acid → Naphtho[1,2-b]furan-2-methanol

To a RB flask equipped with magnetic stirring bar, reflux condenser, N2 inlet line with bubbler was added ethyl naphtho(1,2-b]furan-2-carboxylate (H. G. Pars Pharmaceutical Laboratories, Inc., 6.85 g, 28.5 mmol), lithium borohydride (Aldrich, 0.62 g, 28.5 mmol) and dry THF (400 mL). The mixture was stirred at reflux for 6 h and then poured into H2O (1 L). The reaction mixture was acidified with 1 N HCl and the resulting white solid was filtered, washed with additional H2O (500 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 (80°) to give a total of 4.8 g (69.7%) of naphtho[1,2-b]furan-2-methanol, mp 105.5°-107°, (C,H).

1. customTo a RB flask equipped with magnetic stirring bar
2. temperaturereflux condenser, N2 inlet line with bubbler
3. temperatureat reflux for 6 h
4. filtrationthe resulting white solid was filtered
5. washwashed with additional H2O (500 mL)
6. dissolutionthen dissolved in CH2CL2 (500 mL), dried Na2SO4),
7. filtrationfiltered
8. concentrationconcentrated to 200 mL
9. additiondiluted to 500 mL with hexane
10. filtrationThe resulting material was filtered
11. washwashed with hexane (100 mL)
12. customplaced in a vacuum oven overnight (80°)

ORD record

ord-5b6d132acd364d0bba670a007411b8a5

Source dataset

uspto-grants-1991_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05049581