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

Participants

Reaction Steps

(1R,5R)-3-Benzenesulfonyl-1-(1-naphthyl)-3-methylsulfanyl-bicyclo[3.1.0]hexane (620 mg, 1.6 mmol), methanol (4 mL) and concentrated hydrochloric acid (0.7 mL) were heated to reflux for 7 hours. The reaction was monitored by TLC (ethyl acetate/hexane (20:80)) The reaction mixture was concentrated under reduced pressure to remove methanol. The pH of the reaction mass was adjusted to 8-9 with saturated sodium bicarbonate solution. The aqueous layer was extracted with diethyl ether (50 mL). The organic layer was washed with water, dried over anhydrous sodium sulphate, filtered and evaporated under reduced pressure to yield 458 mg of crude oil, which was purified by preparative HPLC to yield 135 mg (39%) of 99% pure product. 1H NMR δ(300 MHz,CDCl3) 0.76-0.79 (1H,t, J=4 Hz), 1.38 (1H,m), 2.01 (1H,m), 2.49-2.56 (1H,d, J=10Hz), 2.75 (2H,d,J=6 Hz), 3.05-3.15 (2H,dd,J=10 Hz), 7.40-7.45 (1H,m), 7.50-7.56 (3H,m), 7.76-7.79 (1H,d,J=9 Hz), 7.88-7.90 (1H,m), 8.13-8.15 (2H,d ,J=6 Hz). 13CNMR(CDCl3)δ: 218.25, 139.12, 134.01, 128.96, 127.80, 126.77, 126.17, 125.78, 125.33, 124.0, 48.18, 42.46, 27.80, 20.62, 20.05.

Provenance & Evidence