3-Chloro-1H-indazole → N-tert-butyl-2-(3-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 (136 mg, 318 μmol), 3-chloro-1H-indazole (48.6 mg, 318 mmol) in dioxane (3.5 mL) was added sodium tert-butoxide (67.3 mg, 700 μmol) and bis(tri-tert-butylphosphine)palladium(0) (16.3 mg, 31.8 μmol). The mixture was degassed then heated in sealed tube at 125° C. for two days. 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-(3-chloro-1H-indazol-1-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide. 1H NMR (CDCl3) δ: 9.12 (s, 1H), 8.61 (d, J=8.5 Hz, 1H), 8.36 (s, 1H), 7.82 (d, J=8.0 Hz, 1H), 7.70 (s, 1H), 7.58 (ddd, J=8.5, 7.2, 1.1 Hz, 1H), 7.42 (ddd, J=8.1, 7.1, 0.9 Hz, 1H), 5.72 (s, 2H), 3.55-3.62 (m, 2H), 1.61 (s, 9H), 0.95 (d, J=16.6 Hz, 2H), −0.03 (s, 9H).

Provenance & Evidence