Reaction Steps
A microwave vial was charged with (R)-1-cyclopropyl-3-(2-(3,5-dimethyl-1-tosyl-1H-indazol-4-yl)-4-(4-methoxy-3,3-dimethylpiperidin-1-yl)-7,8-dihydropyrido[4,3-d]pyrimidin-6(5H)-yl)propane-1,3-dione (0.563 g, 0.82 mmol) and THF (5 mL) and placed under a nitrogen atmosphere. Methyl hydrazine (87 μL, 1.64 mmol), pyridine (0.25 mL) and Lawesson's reagent (0.366 g, 0.90 mmol) were then added in sequence. The vessel was sealed and heated at 125° C. in a microwave reactor for 12 min. At that point the reaction mixture was concentrated and the residue was purified via FCC (0-10% MeOH/DCM; 10% NH4OH in DCM) to obtain the title compound. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.56-8.61 (m, 1H), 8.05 (d, J=8.6 Hz, 1 H), 7.79 (d, J=8.3 Hz, 2 H), 7.56 (d, J=8.8 Hz, 1 H), 7.38 (d, J=8.6 Hz, 2 H), 5.52 (s, 1 H), 4.08 (d, J=13.4 Hz, 1 H), 3.96 (d, J=15.4 Hz, 1 H), 3.61-3.69 (m, 1 H), 3.55 (s, 3 H), 3.28-3.31 (m, 2 H), 3.26 (s, 3 H), 3.04 (t, J=10.2 Hz, 1 H), 2.94-2.99 (m, 1 H), 2.82-2.92 (m, 2 H), 2.33 (s, 3 H), 2.19 (s, 3 H), 1.86-1.94 (m, 1 H), 1.83 (s, 3 H), 1.67-1.78 (m, 1 H), 1.45-1.58 (m, 1 H), 0.91 (s, 3 H), 0.74-0.83 (m, 5H), 0.50-0.58 (m, 2 H); MS (ESI+) m/z 695.6 (M+H)+.
