Hydrochloric Acid → (1S,5S)-1-(3,4-Dichlorophenyl)bicyclo[3.1.0]hexan-3-one

Participants

Reaction Steps

(1S,5S)-3-Benzenesulfonyl-1-(3,4-dichlorophenyl)-3-methylsulfanyl-bicyclo[3.1.0]hexane (3.5 g, 8.4 mmol), methanol (15 mL) and concentrated hydrochloric acid (3 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 (300 mL). The organic layer was washed with water, dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure to yield 3 g of crude oil, which was purified by preparative HPLC to give 900 mg (45%) of 99% pure product. 1H NMR δ(300 MHz,CDCl3) 0.68-0.70 (1H,t, J=4 Hz), 1.25-1.35 (1H,m), 1.94-2.15 (1H,m), 2.36-2.42 (1H, d, J=10 Hz), 2.59-2.66 (1H,d,J=10 Hz), 2.83-2.89 (2H,m), 6.99-7.03 (1H,dd,J=9,3 Hz), 7.25-7.26 (1H,d,J=3 Hz), 7.36-7.39 (1H,d,J=9 Hz). 13CNMR(CDCl3)δ: 215.28, 143.49, 132.57, 130.4, 130.07, 128.09, 125.41, 45.35, 42.08, 27.20, 23.31, 22.23.

Provenance & Evidence