[Cl:1][C:2]1[C:6]2[CH:7]=[C:8]([CH:20]=O)[C:9]([N:12]3[CH2:17][C@@H:16]([CH3:18])[O:15][C@H:14]([CH3:19])[CH2:13]3)=[C:10]([F:11])[C:5]=2[O:4][N:3]=1.[NH:22]1[C:27](=[O:28])[CH2:26][C:25](=[O:29])[NH:24][C:23]1=[O:30]>CC(O)C>[Cl:1][C:2]1[C:6]2[CH:7]=[C:8]3[C:9](=[C:10]([F:11])[C:5]=2[O:4][N:3]=1)[N:12]1[CH2:17][C@@H:16]([CH3:18])[O:15][C@@H:14]([CH3:19])[C@@H:13]1[C:26]1([C:25](=[O:29])[NH:24][C:23](=[O:30])[NH:22][C:27]1=[O:28])[CH2:20]3A mixture of 3-chloro-6-((2R,6R)-2,6-dimethylmorpholino)-7-fluorobenzo[d]isoxazole-5-carbaldehyde (Intermediate 535, 764 mg, 2.44 mmol) and pyrimidine-2,4,6(1H,3H,5H)-trione (313 mg, 2.44 mmol) in iPrOH (3 ml) was heated at reflux for 3 days. Solvent was removed and the residue was recrystallized from methanol. The solids obtained were recrystallized from 1:1 EtOH-Water to afford 273 mg of product consistent with desired product.
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