Dichloromethane → Tert-butyl 4-[4-(4-aminopyrrolo[2,1-f][1,2,4]triazin-7-yl)phenyl]piperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of 7-bromopyrrolo[2,1-f][1,2,4]triazin-4-amine (801 mg, 3.76 mmol), tert-butyl 4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]tetrahydro-1(2H)-pyrazinecarboxylate (2.19 g, 5.64 mmol), and [1,1′-bis(diphenylphosphino)-ferrocene]dichloro palladium(II)-complex with dichloromethane (275 mg, 0.38 mmol) in degassed DME (25 mL) was added aqueous Na2CO3 solution (2 M, 5.6 mL). The reaction was heated at 80° C. for 17 h and then cooled to rt. The mixture was filtered through a pad of Celite® using ethyl acetate. The filtrate was washed with water (75 mL), dried (Na2SO4), and concentrated. The crude material was purified by ISCO® chromatography using a gradient of 50 to 75% ethyl acetate in hexanes to afford 1.22 g (74%) of the desired product as an off-white solid, which contained trace impurities. 1H NMR (300 MHz, DMSO-d6) δ 7.94-7.88 (m, 2 H), 7.86 (s, 1 H), 7.65 (br s, 2 H), 7.03-6.97 (m, 1 H), 6.94 (d, 1 H), 6.89 (d, 1 H), 3.51-3.42 (m, 4 H), 3.19-3.11 (m, 4 H), 1.42 (s, 9 H); ES-MS m/z 395.1 [M+H]+, HPLC RT (min) 2.52.

Provenance & Evidence