[H-].[Na+].[OH:3][C:4]1([C:10]#[C:11][CH2:12][O:13][CH:14]2[CH2:19][CH2:18][CH2:17][CH2:16][O:15]2)[CH2:9][CH2:8][O:7][CH2:6][CH2:5]1.[H][H].[CH3:22]I>C1COCC1>[CH3:22][O:3][C:4]1([C:10]#[C:11][CH2:12][O:13][CH:14]2[CH2:19][CH2:18][CH2:17][CH2:16][O:15]2)[CH2:5][CH2:6][O:7][CH2:8][CH2:9]1
To a suspension of sodium hydride (1.2 g of an 80% oil dispersion, 50 mmol) in dry THF (45 mL) was added a solution of 4-hydroxy-4-[3-(tetrahydropyran-2-yloxy)-prop-1-ynyl]tetrahydropyran (3.71 g, 15.3 mmol), prepared as in step 1. After hydrogen evolution ceased, methyl iodide (3.0 mL, 48.2 mmol) was added neat and the resulting solution was stirred overnight at ambient temperature. The reaction was quenched by addition of crushed ice and saturated aqueous ammonium chloride. The resulting two-phase mixture was extracted with ether (3×100 mL). The combined organic layers were dried (MgSO4), filtered, and concentrated in vacuo. Purification by chromatography on silica gel (100 g, 10% ethyl acetate: hexanes) provided the methyl ether (3.74 g, 95%) as a colorless oil.
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