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The reaction was carried out similarly as described in the preparation of compound 116, using compound 462 (0.23 mmol) and but-3-yn-1-ol (0.28 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, 147.7, 146.3, 141.4, 140.7, 138.3, 135.4, 135.3, 134.8, 133.8, 132.6, 130.7, 128.7, 123.8, 122.4, 120.9, 120.7, 120.0, 118.8, 117.1, 113.6, 61.6, 28.7, 20.0

1. customThe crude product was purified by flash chromatography