Toluene → di-tert-butyl 1-(1-benzyl-1H-pyrrolo[3,2-b]pyridin-5-yl)hydrazine-1,2-dicarboxylate

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A sealable vial was charged with 1-benzyl-5-chloro-1H-pyrrolo[3,2-b]pyridine (0.25 g, 1.0 mmol, from Step 1), di-tert-butyl hydrazine-1,2-dicarboxylate (0.239 g, 1.03 mmol, Aldrich), tris(dibenzylideneacetone)dipalladium(0) (0.075 g, 0.082 mmol, Aldrich), 1,1′-bis(diphenylphosphino)ferrocene (0.0685 g, 0.124 mmol, Aldrich), cesium carbonate (0.336 g, 1.03 mmol), and toluene (2 mL). The mixture was degassed by a stream of nitrogen through the solution and the vial was then sealed and heated to 100° C. for 2 days. The crude reaction mixture was diluted with DCM, filtered and concentrated. Flash chromatography, eluting with a gradient from 0-50% EtOAc in hexanes afforded product (0.13 g, 29%).

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