Diisopropylethylamine → tert-butyl 3-(3-(3-(methylthio)-1-phenyl-1H-indazol-6-yl)ureido)pyrrolidine-1-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Into a 50-mL 3-necked round-bottom flask, was placed a solution of bis(trichloromethyl)carbonate (200 mg, 0.67 mmol) in dichloromethane (3 mL). To the resulting mixture was then added a mixture of 3-(methylthio)-1-phenyl-1H-indazol-6-amine (500 mg, 1.96 mmol, 1.00 equiv) and DIEA (560 mg, 4.33 mmol, 2.21 equiv) in dichloromethane (2 mL) dropwise with stirring at 0° C. in 30 min. The resulting solution was stirred for 3 h at 15° C. The resulting mixture was added to a solution of tert-butyl 3-aminopyrrolidine-1-carboxylate (440 mg, 2.37 mmol, 1.21 equiv) in dichloromethane (3 mL) dropwise with stirring at 15° C. in 15 min. The resulting solution stirred for an additional 4 h at 15° C. The resulting mixture was concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate:petroleum ether (1:4˜1:3) to yield tert-butyl 3-(3-(3-(methylthio)-1-phenyl-1H-indazol-6-yl)ureido)pyrrolidine-1-carboxylate as a white solid. MS: 468 (MH+).

Herkunft & Nachweise