Potassium Phosphate, Tribasic → Ethyl 4-amino-5-{4-[(tert-butoxycarbonyl)amino]-3-fluorophenyl}pyrrolo[2,1-f][1,2,4]triazine-6-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 1-amino-4-{4-[(tert-butoxycarbonyl)amino]-3-fluorophenyl}-5-cyano-1H-pyrrole-3-carboxylate (18.06 g, 46.5 mmol), formamidine acetate (48.41 g, 464.9 mmol) and finely ground potassium phosphate (19.74 g, 93.0 mmol) in ethanol (350 mL) was heated at 80° C. overnight. After 16 h, the reaction mixture was cooled to rt and diluted with 1.8 L water. The resulting precipitate was filtered thru a glass frit and washed with water. Drying in a vacuum oven provided the title compound as a gray solid (15.6 g, 80.8%) 1H-NMR (DMSO-d6) δ 9.11 (s, 1H), 8.13 (s, 1H), 7.93 (s, 1H), 7.72 (t, J=8 Hz, 1H), 7.26 (dd, J=12, 2 Hz, 1H), 7.12 (dd, J=8, 2 Hz, 1H), 4.07 (q, J=7 Hz, 2H), 1.47 (s, 9H), 1.09 (t, J=7 Hz, 3H); MS [M+H]+ 415.8=;. LCMS RT=3.05.

Provenance & Evidence