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The compound 7 (50 mg, 0.137 mmol) was dissolved in 1 N sodium hydroxide aqueous (1 mL) and methanol (5 mL) and the resulting solution was refluxed for 1 hr. Methanol was removed under vacuum and the residue was extract with ethyl acetate (3×30 mL). The combined extracts were dried over magnesium sulfate, filtered, and concentrated under vacuum to afford a solid. The crude product was purified by recrystallization from methanol to afford title compound 8 ((23 mg) as a white solid. Selected 1H NMR data: (CD3OD, 300 MHz): δ 5.62 (d, 1H, J=3.2 Hz), 4.05 (d, 1H, J=2.4 Hz), 4.02 (m, 1H), 3.43 (dt, br, 1H, J=11.7 Hz, 3.6 Hz), 3.36 (d, 1H, J=4.2 Hz), 1.197 (s, 3H), 0.76 (s, 3H). Melting Point: 238-241° C.

1. customMethanol was removed under vacuum
2. extractionthe residue was extract with ethyl acetate (3×30 mL)
3. dry with materialThe combined extracts were dried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated under vacuum
6. customto afford a solid
7. customThe crude product was purified by recrystallization from methanol