Pyridine → 4-{1-[5-(1-Formyl-cyclopropyl)-isoxazol-3-ylcarbamoyl]-1H-indol-5-yloxy}-5,7-dihydro-pyrrolo[3,4-d]pyrimidine-6-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of SO3.pyridine (0.992 g, 6.23 mmol), triethylamine (1.086 mL, 7.79 mmol) and DMSO (1.11 mL, 15.6 mmol) at 0° C., 4-{1-[5-(1-hydroxymethyl-cyclopropyl)-isoxazol-3-ylcarbamoyl]-1H-indol-5-yloxy}-5,7-dihydro-pyrrolo[3,4-d]pyrimidine-6-carboxylic acid tert-butyl ester (0.83 g, 1.559 mmol) in DCM (5 mL) and DMSO (1 mL) is added. The reaction is stirred at 0° C. for 2 h. After the reaction is complete, it is quenched with NH4CL, extracted, and evaporated. 4-{1-[5-(1-Formyl-cyclopropyl)-isoxazol-3-ylcarbamoyl]-1H-indol-5-yloxy}-5,7-dihydro-pyrrolo[3,4-d]pyrimidine-6-carboxylic acid tert-butyl ester is then obtained using FCC and eluting with 100:0 heptane:EtOAc to 0:100 Heptane:EtOAc. MS (ESI) m/z 531.0 (M+1).

Provenance & Evidence