Potassium Phosphate, Tribasic → N-(cyclopropylmethyl)-5-(3-formyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-5-yl)nicotinamide

Participants

Reaction Conditions

Reaction Steps

A solution of 5-iodo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-3-carbaldehyde (I) (1.068 g, 3.0 mmol), bis(pinacolato)diboron (0.914 g, 3.6 mmol), KOAc (0.883 g, 9.0 mmol) and dry DMF (20 mL) was purged with nitrogen. PdCl2(dppf)2 was added to the reaction and purged again with nitrogen. The solution was heated at 80° C. for 2 h. Once TLC showed the disappearance of (I), the solution was cooled to r.t. To this solution was added K3PO4 (0.955 g, 4.5 mmol), 5-bromo-N-(cyclopropylmethyl) nicotinamide (XVII) (0.765 g, 3.0 mmol), Pd(PPh3)4 (104 mg, 0.09 mmol) and water (2 mL). The solution was purged with nitrogen and heated at 90° C. for 3 h. The reaction was passed through a pad of Celite and then concentrated under reduced pressure. The residue was dissolved in DCM and washed with water and brine, dried over MgSO4 and then evaporated under vacuum. The crude product was purified on a silica gel column (100% EtOAc→2:98 MeOH:DCM) to give N-(cyclopropylmethyl)-5-(3-formyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-5-yl)nicotinamide (XXXI) as a yellow solid (1.09 g, 2.7 mmol, 90% yield), 1H NMR (DMSO-d6) δ ppm 0.20-0.31 (m, 2H), 0.35-0.57 (m, 2H), 1.65 (m, 2H), 1.74-1.87 (m, 1H), 2.10 (d, J=12.06 Hz, 2H), 2.35-2.44 (m, 1H), 3.10-3.27 (m, 3H), 3.78-3.99 (m, 2H), 6.14 (d, J=7.35 Hz, 1H), 7.90-8.14 (m, 2H), 8.50 (d, J=12.5, 2H), 9.05 (dd, J=14.60, 1.98 Hz, 2H), 10.25 (s, 1H); ESIMS found C23H24N4O3 m/z 405 (M+H).

Provenance & Evidence