[O:1]1[CH2:6][CH2:5][C:4](=[O:7])[CH2:3][CH2:2]1.[Li+].C[Si]([N-][Si](C)(C)C)(C)C.[CH3:18][O:19][C:20]1[CH:21]=[C:22]([CH2:26][C:27](Cl)=[O:28])[CH:23]=[CH:24][CH:25]=1.C(O)(=O)C>C1(C)C=CC=CC=1.O>[CH3:18][O:19][C:20]1[CH:21]=[C:22]([CH2:26][C:27]([CH:3]2[C:4](=[O:7])[CH2:5][CH2:6][O:1][CH2:2]2)=[O:28])[CH:23]=[CH:24][CH:25]=1Tetrahydro-4H-pyran-4-one (0.138 mL, 1.50 mmol) was dissolved in toluene (1 mL) and cooled to 0° C. LHMDS (1.573 mL, 1.57 mmol) was added. 3-Methoxyphenylacetyl chloride (0.117 mL, 0.75 mmol) was added after 2 minutes. After 5 minutes, acetic acid (0.129 mL, 2.25 mmol) and water was added. The organic phase was separated and the crude product was purified by flash column chromatography (EtOAc 0-40% in heptane) yielding 3-(2-(3-methoxyphenyl)acetyl)dihydro-2H-pyran-4(3H)-one (86 mg, 46%).
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