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A solution of 6.2 mL of 0.5 M ammonium fluoride in methanol (3.1 mmol) was added to a mixture of compound 58 (1.0 g, 2.57 mmol), acetic acid (530 uL, 9.0 mmol) and methanol (25 mL). The mixture was stirred at room temperature for 2 h. The solvent was removed and the residue was taken up in toluene (2˜3 mL) to assist removal of AcOH. After solvent was removed, the residue was taken up in DCM. The resulting white solids were filtered off. Concentration of the filtrate gave 0.70 g of the crude 59 with purity: 91.1%, 1HNMR (300 MHz, CDCl3): 2.60 (m, 2H), 3.38 (m, 1H), 3.87 (s, 3H), 3.98 (d, 1H), 5.22 (m, 4H), 5.83 (m, 1H), 6.15 (b, s, 1H), 6.90 (d, 2H), 7.35 (d, 2H). Anal. C15H17NO4, Mol. Wt.: 275.3. Found: ESI-MS: 275.8 (M+H)+.

1. customThe solvent was removed
2. customremoval of AcOH
3. customAfter solvent was removed
4. filtrationThe resulting white solids were filtered off
5. customConcentration of the filtrate gave 0.70 g of the crude 59 with purity: 91.1%, 1HNMR (300 MHz, CDCl3): 2.60 (m, 2H), 3.38 (m, 1H), 3.87 (s, 3H), 3.98 (d, 1H), 5.22 (m, 4H), 5.83 (m, 1H), 6.15 (b, s, 1H), 6.90 (d, 2H), 7.35 (d, 2H)