Hydrochloric Acid → 4-(4-chloro-6-(4-chloro-3-cyclopropyl-1-methyl-1H-pyrazol-5-yl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-2-yl)-3,5-dimethyl-1H-indazole-1-carbaldehyde

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-(4-chloro-3-cyclopropyl-1-methyl-1H-pyrazol-5-yl)-2-(3,5-dimethyl-1-tosyl-1H-indazol-4-yl)-4-methoxy-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine (5.4 g, 8.74 mmol) in EtOH (50 mL) was added concentrated HCl (21.2 mL, 699 mmol) at room temperature, and the reaction mixture was then heated to 100° C. for 24 h. The mixture was then cooled to room temperature and 200 mL of water was added. Then, solid NaOH was added until the pH of the solution reached pH 10. EtOAc was added to the reaction mixture and the resulting layers were separated and the aqueous layers were extracted with EtOAc (3×). The organic layers were combined and the combined organics were dried (Na2SO4), filtered and concentrated to a light yellow solid and used without further purification. The yellow solid (2.47 g, 5.49 mmol) was dissolved in DMF (55 mL) and Vilsmeier reagent (3.51 g, 27.4 mmol) was added to the mixture at room temperature, and the reaction mixture was stirred for 15 min. Then, the reaction mixture was poured into water, and Et2O added. The layers were separated and the aqueous layer was extracted with Et2O. The organics were combined and washed with 5% aqueous LiCl. The organics were then dried (Na2SO4), filtered and concentrated to a yellow oil. The residue was purified by FCC (20-100% EtOAc/heptane) to provide 4-chloro-6-(4-chloro-3-cyclopropyl-1-methyl-1H-pyrazol-5-yl)-2-(3,5-dimethyl-1H-indazol-4-yl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine and 4-(4-chloro-6-(4-chloro-3-cyclopropyl-1-methyl-1H-pyrazol-5-yl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-2-yl)-3,5-dimethyl-1H-indazole-1-carbaldehyde, MS (ESI+) m/z 468.1 (M+H)+ and MS (ESI+) m/z 496.1 (M+H)+, respectively.

Provenance & Evidence