Water → HCID 56840382, compound

Participants

Reaction Steps

Bromoethane (0.87 mmol) was added slowly to a solution 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-3-phenylpropane-1,3-dione (XX) (0.39 mmol) and K2CO3(1.58 mmol) in DMSO (4 mL) stirred at room temperature under nitrogen. The solution was further stirred overnight at room temperature under nitrogen. The solution was poured into a mixture of water and ether. The etheric layer was separated, washed with brine, dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography to get 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-2-ethyl-3-phenylpropane-1,3-dione 17 as colorless viscous oil (35% yield). 1H NMR (DMSO-d6, 400 MHz): δ ppm 0.93 (t, J=7.4 Hz, 3H), 1.93 (m, 2H), 4.28 (m, 2H), 4.33 (m, 2H), 5.60 (t, J=6.5 Hz, 1H), 6.99 (d, J=8.6 Hz, 1H), 7.51-7.55 (m, 4H), 7.66 (m, 1H), 7.98 (d, J=7.3 Hz, 2H); ESIMS found C19H18O4 m/z 311 (M+H) and 1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-2,2-diethyl-3-phenylpropane-1,3-dione 18 as a white solids. ESIMS found C21H22O4 m/z 339 (M+H).

Provenance & Evidence