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. 2018 Apr 19;12:887–899. doi: 10.2147/DDDT.S160314

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© 2018 Xiao et al. This work is published and licensed by Dove Medical Press Limited

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Scheme 1 — General synthetic method for 6-hydroxyl-2-benzylidene-1-indanone derivatives 4a-t. Reagents and conditions: (a) 3,4-dihydro-2H-pyran, PPTS, 4 h, CH₂Cl₂, 40°C; (b) various benzaldehydes, EtOH, 20% (w/v) NaOH, room temperature, overnight; (c) 1.0 mol/L HCl, EtOH, room temperature, 5 h; (d) HCl (gas), EtOH, room temperature, overnight.