Water → 4-(4-chloro-6-(5-isopropyl-2-methylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-2-yl)-3,5-dimethyl-1H-indazole-1-carbaldehyde

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To a suspension of 2-(3,5-dimethyl-1H-indazol-4-yl)-6-(5-isopropyl-2-methylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-ol (1.3 g, 3.04 mmol) in DCE (50 mL) was added Vilsmeier reagent (1.95 g, 15.2 mmol). The mixture was heated at 50° C. for 2 h. LC-MS showed reaction complete. The reaction mixture was poured into water, and the layers were separated. The aqueous layer was extracted with DCM. The organics were combined and concentrated. The residue was purified by FCC (0-100% EtOAc/heptane) to provide 4-chloro-2-(3,5-dimethyl-1H-indazol-4-yl)-6-(5-isopropyl-2-methylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidine MS (ESI+) m/z 446.3 (M+H)+ and 4-(4-chloro-6-(5-isopropyl-2-methylphenyl)-5,6,7,8-tetrahydropyrido[4,3-d]pyrimidin-2-yl)-3,5-dimethyl-1H-indazole-1-carbaldehyde MS (ESE) m/z 474.3 (M+H)+.

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