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To a suspension of 5 (0.24 g, 0.472 mmol) in ethanol (15 mL) was added Raney Nickel (W.R. Grace and Co. Raney® 4200, slurry, in H2O) under argon. The mixture was subsequently saturated with hydrogen using a hydrogen balloon. After 1.5 h, the mixture was flushed with argon, filtered using EtOH and concentrated. Purification by flash chromatography (95:5 DCM:MeOH) afforded 6 (0.112 mg, 49%) as a bright yellow solid. Rf=0.38 (95:5 DCM:MeOH). 1H NMR (400 MHz, DMSO) δ 10.97 (s, 1H), 9.09 (s, 1H), 9.04 (s, 1H), 7.71-7.52 (m, 2H), 7.49-7.18 (m, 5H), 7.10 (m, 1H), 5.07-4.85 (m, 2H), 2.96 (m, 2H), 2.55 (m, 2H), 2.44 (m, 1H), 2.22 (m, 2H), 2.02 (m, 1H), 1.40 (m, 2H), 1.22 (m, 2H). MS (ESI) m/z calcd for C25H27N4O6 [M+H]+ 479.5, found 479.9.

1. customthe mixture was flushed with argon
2. filtrationfiltered
3. concentrationconcentrated
4. customPurification by flash chromatography (95:5 DCM:MeOH)