5-iodo-N-methoxy-N-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carboxamide → 5-iodo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carbaldehyde

Participants

Reaction Steps

Lithium aluminum hydride (160 mg, 4.21 mmol) was added in portions to a cooled (0° C.) solution of 5-iodo-N-methoxy-N-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carboxamide (XVIII) (1.46 g, 3.5 mmol) in THF. Stirring was continued at 0° C. until the reaction was completed, approximately 30 min. The reaction was quenched by the slow addition of EtOAc at 0° C., and the whole mixture was poured into 0.4 N NaHSO4. The organic layer was washed with brine, dried over MgSO4, concentrated, and purified on a silica gel column (100% EtOAc→3:97 MeOH:DCM) to give 5-iodo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carbaldehyde (II) as a white solid (0.90 g, 3.15 mmol, 72% yield). 1H NMR (DMSO-d6) δ ppm 1.50-1.71 (m, 2H), 1.71-1.87 (m, 1H), 1.97-2.15 (m, 2H), 2.31-2.42 (m, 1H), 3.66-3.99 (m, 2H), 5.96-6.17 (m, 1H), 7.78 (d, J=6 Hz, 1H), 7.84 (d, J=6 Hz, 1H), 8.50 (s, 1H), 10.13 (s, 1H); ESIMS found for C13H13IN2O2 m/z 357 (M+H).

Provenance & Evidence