Triethylamine → (3S)-3-(3-Chlorophenyl)cyclopentanone

Participants

Reaction Steps

Bis(norbornadiene)rhodium(I)tetrafluoroborate (0.20 g, 0.53 mmol) and (S)-(−)-2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl (0.30 g, 0.48 mmol) are dissolved 1,4-dioxane (18 mL). The solution is degassed with nitrogen for 2 hours. 3-Chlorophenylboronic acid (4.95 g, 31.67 mmol) is dissolved in dioxane (24 mL) and water (6 mL). The mixture is degassed for another 2 hours. The two solutions are combined and stirred for two hours under a nitrogen stream. 2-Cyclopentenone (2.0 g, 24.36 mmol) and triethylamine (2.1 mL, 15.07 mmol) are added to the reaction sequentially, via syringe. This is stirred until completion under a stream of nitrogen. The reaction is filtered through a pad of diatomaceous earth and concentrated in vacuo. The residue is purified via silica gel flash chromatography, eluting with 20% ethyl acetate in hexane to give the title compound (4.23 g, 89.2%) as a clear, yellow oil. 1H NMR (400 MHz, CDCl3) δ 1.9 (1H, M), 2.25 (2H, M), 2.45 (2H, M), 2.65 (1H, M), 3.35 (1H, M), 7.1 (1H, D), 7.25 (3H, M).

Provenance & Evidence