1,1'-Carbonyldiimidazole → ethyl 2-amino-2-(((2-(4-((tert-butoxycarbonyl)amino)-1H-indazol-1-yl)-2-(4-chlorophenyl)butanoyl)oxy)imino)acetate

Participants

Reaction Steps

To a suspension of 2-(4-((tert-butoxycarbonyl)amino)-1H-indazol-1-yl)-2-(4-chlorophenyl)butanoic acid from Step A above (0.16 g, 0.37 mmol) in DCM (1.5 mL) was added 1,1′-carbonyldiimdazole (0.13 g, 0.78 mmol) to give a clear solution. The mixture was stirred for 7.5 hours at RT followed by addition of ethyl 2-oximinooxamate (0.13 g, 0.93 mmol). After stirring at RT overnight, the resulting mixture was diluted with EtOAc, washed with saturated NaHCO3 solution, water and brine. The organic layer was separated, and concentrated. The resulting crude product was re-dissolved in a mixture of acetonitrile and water and dried in a lyophilized to give the title compound as light yellow solid. LC/MS m/z=544.1 [M+H]+.

Provenance & Evidence