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The reaction was carried out similarly as described in the preparation of compound 116, using compound 459 (0.26 mmol) and but-3-yn-1-ol (0.29 mmol). The crude product was purified by flash chromatography using EtOAc/petroleum ether (40-60) 6:1 as the eluent to afford the title compound as light yellow foam. 13C NMR (CDCl3) δ 194.9, 163.6 (d), 147.6, 146.3, 141.8 (d), 140.7, 138.3, 135.4, 134.8, 133.8, 132.6, 130.9 (d), 128.7, 122.4, 120.9, 120.0, 117.1, 116.1 (d), 113.7, 110.5 (d), 107.6 (d), 61.6, 28.7, 20.0

1. customThe crude product was purified by flash chromatography