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General Procedure S. A solution of 1-benzyl-N-(3,4-difluorobenzyl)-2-isopropyl-6-nitro-1H-indole-3-carboxamide (Compound 124, 300 mg, 0.65 mmol) in EtOAc (5 ml) was treated with 10% Pd—C (6.8 mg, 0.065 mmol) and hydrogen gas under atmospheric pressure at room temperature for 16 h. The mixture was filtered and concentrated in vacuo. The residue was purified by chromatography on silica gel (0→50% EtOAc-hexanes) to yield the title compound as a yellow oil.

1. filtrationThe mixture was filtered
2. concentrationconcentrated in vacuo
3. customThe residue was purified by chromatography on silica gel (0→50% EtOAc-hexanes)