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Compound 3 (1.224 g, 4.277 mmol) and triethylphosphite (1.512 mL, 8.555 mmol) were heated to 150° C. for 3 hours. The reaction mixture was cooled to 0° C. and then 6 mL of DMF and 6 mL of EtOH were added. NaOMe (486 mg, 8.554 mmol) and 4-(methoxymethoxy)-3,5-dimethylbenzaldehyde (0.831 g, 4.277 mmol) were added to the solution. After 18 hours, the mixture was diluted with EtOAc and the solution was washed with brine. After drying on Na2SO4, the organic layer was filtered and concentrated under reduced pressure. The residue was subjected to chromatography over silica gel (Hexanes/EtOAc=9/1) to give Compound 4 (1.10 g, 67%). 1H-NMR (500 MHz, CDCl3) δ 7.56 (s, 1H), 7.30 (m, 1H), 7.20 (s, 2H), 7.06 (d, J=16.3 Hz, 1H), 6.99 (d, J=16.3 Hz, 1H), 6.97 (s, 1H), 4.96 (s, 2H), 4.39 (q, J=7.1 Hz, 2H), 3.62 (s, 3H), 3.03 (s, 6H), 2.32 (s, 6H), 1.42 (t, J=7.1 Hz, 3H); 13C-NMR (125 MHz, CDCl3) δ 167.23, 154.65, 150.72, 138.36, 133.12, 131.48, 131.24, 128.70, 127.78, 127.07, 115.70, 114.53, 112.47, 99.11, 60.92, 57.39, 40.65, 16.99, 14.40; ESI-MS: m/z (MH+): 384.2169 (calc'd), 384.2173 (found).

1. washthe solution was washed with brine
2. customAfter drying on Na2SO4
3. filtrationthe organic layer was filtered
4. concentrationconcentrated under reduced pressure