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To a solution of alcohol 4b (300 mg, 0.72 mmol) in THF (10 mL) at 0° C. was added NaH (60% in mineral oil, 35 mg, 0.87 mmol). The mixture was allowed to stir at 0° C. for an additional 30 min then allyl bromide (93 μL, 1.08 mmol) was added dropwise. The reaction was allowed to warm to room temperature and maintained for an additional 6 h. The reaction was quenched with saturated NH4Cl (1 mL) and partitioned between EtOAc (100 mL) and H2O (50 mL). The organic layer was washed with brine (50 mL) and dried over Na2SO4. The solvent was removed by rotary evaporation, the resulting brown oil was purified by flash column chromatography (EtOAc/hexanes, 1:9-1:1) to give 10 (316 mg, 0.69 mmol, 97%) as a pale yellow oil: 1H NMR (500 MHz, CDCl3) δ 1.07-1.09 (d, J=6.0 Hz, 3H), 1.16-1.19 (d, J=6.0 Hz, 3H), 1.25-1.35 (m, 6H), 2.13 (s, 6H), 2.39 (s, 3H), 3.01-3.05 (dd, J=5.5, 15.5 Hz, 1H), 3.20-3.25 (dd, J=9.5, 15.0 Hz, 1H), 3.67-3.68 (dd, J=3.0, 4.5 Hz, 1H), 3.89-3.94 (dd, J=7.0, 13.0 Hz, 1H), 4.02-4.03 (d, J=5.0 Hz, 1H), 4.24-4.28 (dd, J=4.5, 12.0 Hz, 1H), 4.93-4.96 (m, 1H), 4.97-5.17 (m, 1H), 5.17-5.19 (d, J=10.0 Hz, 1H), 5.25-5.29 (dd, J=1.5, 17.0 Hz, 1H), 5.80-5.95 (m, 3H), 6.86 (s, 1H), 7.02 (s, 1H); 13C NMR (125 MHz, CDCl3) δ 13.6, 21.2, 21.8, 21.9, 22.0, 22.1, 35.6, 47.7, 68.5, 68.9, 72.1, 78.1, 106.9, 118.0, 120.4, 123.7, 128.7, 134.2, 149.7, 151.8, 158.8, 170.4, 171.2; LCQ-MS (M+H+) calcd for C26H37N2O5 457. found 457; LC-TOF-MS (M+H+) calcd for C26H37N2O5 457.27025. found 457.26984.

1. temperatureto warm to room temperature
2. temperaturemaintained for an additional 6 h
3. customThe reaction was quenched with saturated NH4Cl (1 mL)
4. custompartitioned between EtOAc (100 mL) and H2O (50 mL)
5. washThe organic layer was washed with brine (50 mL)
6. dry with materialdried over Na2SO4
7. customThe solvent was removed by rotary evaporation
8. customthe resulting brown oil was purified by flash column chromatography (EtOAc/hexanes, 1:9-1:1)