To the reaction mixture from the above step containing (1R,3R)-3-(1-Benzenesulfonyl-5-nitro-1H-pyrrolo[2,3-b]pyridin-4-ylamino) cyclohexanol (8.65 mmol) in isopropyl alcohol (30 mL) was added 10% Palladium on activated carbon (718 mg). The reaction mixture was then capped with a 3 way glass valve with a hydrogen gas balloon. The flask was opened to vacuum for two minutes, followed by opening to hydrogen. This purge/flush cycle was repeated 3 times before stirring under a hydrogen atmosphere at room temperature for 2 days. LC/MS showed that the reaction went to completion. The reaction mixture was then filtered through celite 545 and concentrated to give a black foamy solid, which was used as is for the next step. LCMS (Method M, ESI): RT=1.44 min, m+H=386.8.
