1,3-Dibromopropane → N-[3-(5-methyl-4-phenoxy-pyrrolo[2,1-f][1,2,4]triazin-6-yloxy)-propyl]-methanesulfonamide

Participants

Reaction Steps

A solution of 4-phenoxy-5-methyl-6-hydroxypyrrolo-[2,1-f][1,2,4]triazine (1.05 g, 4.35 mmol), 1,3-dibromopropane (4.0 g, 20 mmol), and K2CO3 (3 g, 22 mmol) was heated at 70° C. for 2 h. The solvent was removed in vacuo. The residue was purified by flash column chromatography (silica gel, eluting from dichloromethane to 20% ethyl acetate/dichloromethane) to afford the crude intermediate (1.35 g, 86% yield). This intermediate (1.3 g, 3.59 mmol) was heated with methanesulfonamide (2.0 g, 21 mmol) and K2CO3 (4 g, 29 mmol) in DMF (15 mL) for 2 h. The mixture was cooled, diluted with dichloromethane, washed twice with 5% Na2CO3 solution, dried and concentrated. The residue was purified by flash column chromatography (silica gel, 20% ethyl acetate/dichloromethane) to afford N-[3-(5-methyl-4-phenoxy-pyrrolo[2,1-f][1,2,4]triazin-6yloxy)-propyl]-methanesulfonamide (1.1 g, 81%) as a white solid. MS: (M+H)+=377.

Provenance & Evidence