Hydrochloric Acid → (1R,5S)-1-(1-naphthyl)-3-oxabicyclo[3.1.0]hexan-2-one

Participants

Reaction Steps

(1R)-2-Hydroxymethyl-1(1-naphthyl)-cyclopropanecarbonitrile (1a 10 g, 44.6 mmol), ethanol (20 mL) and 25N sodium hydroxide solution (10 mL) were heated under reflux for 18 hours. The reaction is monitored by TLC (dichloromethane (100%)). The reaction mixture was cooled to room temperature and ice cold water (12 mL) was added to the reaction mixture followed by concentrated hydrochloric acid drop wise to adjust the pH of the reaction mass to 1-2 and stirred for overnight. The aqueous layer was extracted with dichloromethane (200 mL). The organic layer was washed with 3% sodium bicarbonate solution, dried over anhydrous sodium sulphate, filtered and evaporated under reduced pressure to yield 5 g (50%) of product. 1H NMR δ(300 MHz,CDCl3): 0.78-0.81 (1H,m), 1.45-1.48 (1H,m,), 1.68-1.72 (1H,m,) 2.45-2.51 (1H,m), 4.37-4.40 (1H,d, J=9 Hz), 4.65-4.69 (1H,dd, J=9,3 Hz), 7.34-7.52 (4H,m), 7.76-7.91 (3H,m).

Provenance & Evidence