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Synthesis of monoarylidene dicarbonyl derivative 4 and curcumin II (demethoxycurcumin) 5. Reagents and conditions. (i) (excess of acetylacetone), vanillin, B2O3, B[(OBu)3], EtOAc, 80 °C, 30 min; then, addition of nBuNH2, room temperature, 24 h; (ii) 4-hydroxybenzaldehyde, B2O3, B[(OBu)3], 50 °C, 30 min; then, addition of nBuNH2, 50 °C, 24 h.
