[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[C:10]([O:14][CH3:15])[CH:9]=[C:8]2[C:4]=1[CH:5](C1C=C(OC)C(OC)=C(OC)C=1)[CH2:6][C:7]2=[O:16].C(=O)([O-])[O-].[K+].[K+].C1OC2C=CC(C=O)=CC=2O1.Cl>O>[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[C:10]([O:14][CH3:15])[CH:9]=[C:8]2[C:4]=1[CH2:5][CH2:6][C:7]2=[O:16]
4,5,6-trimethoxy-3-(3,4,5-trimethoxyphenyl)-indan-1-one (formula 7, 250 mg) was taken in 5% aqueous-methanolic (1:3) potassium carbonate (10 mL). To this stirred solution 3,4-methylenedioxybenzaldehyde (100 mg) was added and further stirred at room temperature at 30° C. for 1 hour. On completion, the reaction mixture was diluted with water, acidified with dil. HCl and extracted with ethyl acetate. The organic layer was washed with water, dried over anhydrous sodium sulphate and evaporated to get a residue. The residue was purified through silica gel column to get 2-benzo[1,3]dioxo-5-ylmethylene-4,5,6-trimethoxy-3-(3,4,5-trimethoxyphenyl)-indan-1-one (formula 8, 206 mg)
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