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The reaction was carried out similarly as described in the preparation of compound 116, using compound 465 (0.25 mmol) and but-3-yn-1-ol (0.30 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 194.8, 148.9, 146.3, 141.1, 139.7, 139.6, 138.1, 135.6, 134.8, 134.0, 132.5, 129.5, 127.5, 125.2, 122.3, 122.2, 120.7, 119.9, 118.7, 116.3, 112.8, 61.6, 28.7, 21.5, 19.9

1. customThe crude product was purified by flash chromatography