Experimental Section
Preparation of the Title Compound 2b. To a stirred suspension of 2′-hydroxyacetophenone (4) (1 g, 2.3 mmol) in dichloromethane (10 mL) was added EDC (881 mg, 4.6 mmol) followed by DMAP (562 mg, 4.6 mmol). Upon complete dissolution, benzoic acid 6b (2.3 mmol) was added. The mixture was stirred at rt for 4 h and concentrated under reduced pressure. The ester (7) (2.3 mmol) thus obtained was dissolved in toluene (10 mL), and the resulting solution was treated with K2CO3 (636 mg, 4.6 mmol) and tetra-n-butylammonium bromide (741 mg, 2.3 mmol). After stirring for 3 h at 90 ℃, solid materials were removed by filtration, and the filtrate was concentrated under reduced pressure. The crude compound obtained above was dissolved in MeOH (5 mL), and the resulting solution was treated with p-TsOH (10 mmol) at 0 ℃. The reaction mixture was stirred for 4 h at room temperature, and then concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (2:1 = Hex:Acetone) to give 2-(2-(3-hydroxyprop-1-yn-1-yl)-5-(3,5,7-trihydroxy-4-oxo-4Hchromen-2-yl)phenyl) acetonitrile (2b) as yellow powder: 1H NMR (400 MHz, Acetone-d6) δ 12.8 (s, OH), 7.42 (d, J = 8.4 Hz, 1H), 7.27 (d, J = 2.0 Hz, 1H), 7.12 (dd, J = 2.1, 8.4 Hz, 1H), 6.44 (d, J = 2.1 Hz, 1H), 6.40 (d, J = 2.2 Hz, 1H), 4.42 (s, 2H), 4.12 (s, 2H); 13C NMR (100 MHz, DMSO-d6) δ 176.1, 166.7, 161.8, 160.3, 147.2, 136.6, 133.5, 130.2, 128.1, 126.9, 125.9, 122.3, 117.8, 104.8, 99.5, 95.1, 98.6, 88.4, 52.6, 23.5.
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