5-isopropyl-1-methyl-3-(tributylstannyl)-1H-indazole → (7-(tert-butylcarbamoyl)-2-(5-isopropyl-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazin-5-yl)methyl pivalate

Participants

Reaction Steps

A mixture 5-isopropyl-1-methyl-3-(tributylstannyl)-1H-indazole, (2-bromo-7-(tert-butylcarbamoyl)-5H-pyrrolo[2,3-b]pyrazin-5-yl)methyl pivalate (0.408 g, 1 mmol), CuI (0.06 g, 0.32 mmol) and Pd(PPh3)4 (0.06 g, 0.052 mmol) in 40 mL of DMF was stirred at 80° C. under nitrogen for 4 hours. The solvent was removed under reduced pressure and the residue was triturated with water (15 mL) and petroleum ether (30 mL) then decanted and dried to give crude (7-(tert-butylcarbamoyl)-2-(5-isopropyl-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazin-5-yl)methyl pivalate (0.15 g) as a yellow solid, which was used into next step without further purification. LCMS: (M+H)+=505.

Provenance & Evidence