[NH2:1][C:2]1[N:9]=[CH:8][CH:7]=[C:6]([O:10]C)[C:3]=1[C:4]#[N:5].Br[CH:13]([CH2:16][C:17]([F:20])([F:19])[F:18])[CH:14]=O.CCOCC>CCO>[OH:10][C:6]1[CH:7]=[CH:8][N:9]2[C:13]([CH2:16][C:17]([F:20])([F:19])[F:18])=[CH:14][N:1]=[C:2]2[C:3]=1[C:4]#[N:5]A mixture of compound D3 (3.31 g, 22.19 mmol) and D4 (6.2 g, 21.86 mmol) in EtOH (10 ml) was subjected to microwave heating at 156° C. for 40 min. After cooling to room temperature, the solvent was evaporated in vacuo. The residue thus obtained was treated with Et2O and a solid precipitated. The solid was filtered off, washed with EtOAc and dried in vacuo to yield compound D5 (1 g, 18%).
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