6-chloro-1H-indazole → N-tert-butyl-2-(6-chloro-1H-indazol-1-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 2-bromo-N-tert-butyl-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (150 mg, 351 μmol) and 6-chloro-1H-indazole 64.3 mg, 421 μmoll) in dioxane (5.25 mL) was added sodium tert-butoxide (74.2 mg, 772 μmol) and bis(tri-tert-butylphosphine)palladium(0) (17.9 mg, 35.1 μmol). The mixture was degassed then heated in sealed tube at 125° C. for 15 h. The mixture was cooled, filtered through celite, the cake washed with ethyl acetate, and the combined filtrates were concentrated in vacuo. Purification by chromatography (silica, 24 g Analogix column, 0-40% ethyl acetate in hexanes) gave N-tert-butyl-2-(6-chloro-1H-indazol-1-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (120 mg, 69%).

Provenance & Evidence