Cesium carbonate → di-tert-butyl 1-{1-benzyl-2-[(benzyloxy)carbonyl]-1H-pyrrolo[3,2-b]pyridin-5-yl}hydrazine-1,2-dicarboxylate

Participants

Reaction Conditions

Reaction Steps

Benzyl 1-benzyl-5-chloro-1H-pyrrolo[3,2-b]pyridine-2-carboxylate (1.13 g, 3.00 mmol, from Step 1) and di-tert-butyl hydrazine-1,2-dicarboxylate (0.77 g, 3.3 mmol, Aldrich), dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine-(2′-aminobiphenyl-2-yl)(chloro)palladium (1:1) (0.24 g, 0.30 mmol, Aldrich) and Cs2CO3 (0.98 g, 3.0 mmol, Aldrich) were combined in toluene (27 mL) and the mixture was degassed by bubbling a stream of nitrogen through the solution for 10 minutes. The reaction was stirred at 110° C. for 5 hours. The reaction mixture was partitioned between water and ethyl acetate, the aqueous was extracted three times, the combined organic extracts were dried over sodium sulfate, filtered and concentrated. Flash chromatography, eluting with a gradient from 0-40% EtOAc in hexanes was used to purify the product. Yield: (1.12 g, 65%).

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