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A solution of 6A (0.554 g, 2.31 mmol) in MeOH (60 mL) was hydrogenated (60 psi) over 10% palladium on carbon (99 mg) for 3 h at rt. The reaction mixture was filtered and concentrated under reduced pressure to give 6B (464 mg, 96%) as an off-white solid. 1H NMR (400 MHz, CDCl3) δ 1.30 (t, J=7.25 Hz, 3H), 3.30 (q, J=7.47 Hz, 2H), 4.62 (s, 2H), 6.89 (dd, J=8.79, 2.64 Hz, 1H), 7.04 (d, J=2.20 Hz, 1H), 7.83 (d, J=8.79 Hz, 1H).

1. customfor 3 h
2. customat rt
3. filtrationThe reaction mixture was filtered
4. concentrationconcentrated under reduced pressure