[CH:1]#[C:2][CH:3]([OH:9])[CH2:4][CH2:5][CH2:6][CH2:7][CH3:8].[Si:10](Cl)([C:13]([CH3:16])([CH3:15])[CH3:14])([CH3:12])[CH3:11].N1C=CN=C1>CN(C=O)C.CCOCC>[C:13]([Si:10]([CH3:12])([CH3:11])[O:9][CH:3]([CH2:4][CH2:5][CH2:6][CH2:7][CH3:8])[C:2]#[CH:1])([CH3:16])([CH3:15])[CH3:14]To a solution of 1-octyn-3-ol (5.0 g, 0.039 mol) in DMF (50 mL) were added tert-butyldimethylsilyl chloride (7.16 g, 0.0475 mol) and imidazole (3.2 g, 0.0475 mol). The resulting solution was stirred at RT for 18 h then diluted with ether (200 mL) and washed with water (2×200 mL), saturated solution of NH4Cl (200 mL), and brine (200 mL). The organic solution was dried over sodium sulfate and concentrated in vacuo to afford the desired compound (9.0 g, 95%) as a colorless oil used in the next step without further purification. Rf 0.9 (EtOAc/hexanes 1/9); 1H NMR (CDCl3) δ 0.09 (s, 3H), 0.12 (s, 3H), 0.89 (s, 9H), 0.85-1.00 (t, 3H), 1.20-1.70 (m, 8H), 2.35 (s, 1H), 4.30-4.35 (m, 1H).
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