Methanol → 2-[4-Hydroxyphenyl]-3-(3,5-dimethoxyphenyl)acrylic acid methyl ester

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Reaction Steps

Methanol (3.0 L) was added to a thoroughly dried 7 (427.5 g, 1.42 mol) under argon. To this stirred suspension concentrated sulfuric acid (100 mL) was added and heated at reflux for 20 h under nitrogen. Methanol was evaporated under reduced pressure at 30° C. The residue was taken up in ethyl acetate (3.0 L) and washed with water (2×1.0 L), saturated aqueous Na HCO3 (2×1.0 L), brine (2×1.0 L). The organic layer was dried on anhydrous magnesium sulfate, filtered and the solvent was evaporated. The residue obtained was dried thoroughly under high vacuum as white solid, (433.6 g 97%): mp 106-108° C.; 1HNMR(360 MHz, CDCl3): δ 7.72 (s, 1H), 7.06 (d, J=7.9 Hz, 2H), 6.77 (d, J=7.9 Hz, 2H), 6.33 (t, J=2.2 Hz, 1H), 6.26 (d, J=2.2 Hz, 2H), 5.74 (s, 1H), 3.81 (s, 3H), 3.60 (s, 6H); MS (EI) m/z 315[M]+; Anal. (C18H18O5) C, H.

Provenance & Evidence