4-Methylmorpholine → (R)-2-{3-fluoro-4-[(6-fluoro-1H-indazole-3-carbonyl)-amino]-phenyl}-morpholine-4-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of (+)-(R)-2-(4-amino-3-fluoro-phenyl)-morpholine-4-carboxylic acid tert-butyl ester (40 mg) in THF (6 ml) and DMF (2 ml) were added sequentially N-methylmorpholine (0.12 ml), TBTU (128 mg) and 6-fluoro-1H-indazole-3-carboxylic acid (47 mg, CAS 129295-30-3) and the mixture was heated at 50° C. for 24 h and then at 60° C. for 18 h. The mixture was then concentrated in vacuo and the residue was purified by column chromatography (SiO2; gradient: heptane/EtOAc) to give (R)-2-{3-fluoro-4-[(6-fluoro-1H-indazole-3-carbonyl)-amino]-phenyl}-morpholine-4-carboxylic acid tert-butyl ester (15 mg, 24%) as a white solid. MS (ISP): 476.1 ([M+NH4]+), 459.1 ([M+H]+), 403.1 ([M+H—C4H8]+).

Provenance & Evidence