Ethyl Acetate → {2-[4-(6-Methoxy-3-methyl-2-phenyl-naphthalen-1-yloxy)-phenyl]-vinyl}-phosphonic acid diethyl ester

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Reaction Steps

To a stirring solution of tetraethyl methylenediphosphonate (0.11 mL, 0.537 mmol) in hexanes (1 mL) was slowly added 1.6 M nBuLi (0.051 mL, 0.537 mmol) at 0° C. The reaction mixture was stirred at room temperature for 2 h under nitrogen. The reaction mixture was cooled to 0° C. then a solution of 4-[(6-methoxy-3-methyl-2-phenyl-1-naphthyl)oxy]benzaldehyde (8) (0.198 g, 0.537 mmol) in THF (1 mL) was added dropwise. After addition, reaction mixture was stirred at above temperature for 10 min then heated at 80° C. for 3 h. Reaction mixture was cooled to room temperature then diluted with water followed by EtOAc. The layers were separated and the aqueous layer was extracted with EtOAc. The combined organic layers were washed with water followed by brine, dried over MgSO4, filtered and concentrated to give oil. The crude oil was chromatographed with 9% EtOAc in hexanes followed by straight MeOH to give 0.151 g (56%) of the title compound (197) as oil. 1H NMR (400 MHz, d-CDCl3): δ 1.33 (t, J=7.1 Hz, 6H), 2.25 (s, 3H), 3.93 (s, 3H), 4.07-4.11 (m, 4H), 6.01 (t, J=17.6 Hz, 1H), 6.59 (d, J=8.8 Hz, 2H), 7.03 (dd, J1=2.4, J2=9.2 Hz, 1H), 7.12-7.14 (m, 3H), 7.22-7.28 (m, 5H), 7.30-7.36 (m, 1H), 7.40 (s, 1H), 7.69 (d, J=9.1 Hz, 1H).

Provenance & Evidence