Cl/[C:2](/[N+]([O-])=O)=[CH:3]\[C:4]1[CH:9]=[CH:8][C:7]([CH2:10][CH3:11])=[CH:6][CH:5]=1.[OH:15][C:16]1[CH:21]=[C:20]([OH:22])[N:19]=[CH:18][N:17]=1.N12CCCN=C1CCCCC2>C(O)C>[CH2:10]([C:7]1[CH:8]=[CH:9][C:4]([C:3]2[C:21]3[C:20](=[O:22])[NH:19][CH:18]=[N:17][C:16]=3[O:15][CH:2]=2)=[CH:5][CH:6]=1)[CH3:11]Analogously to the literature method [D. Dauzonne, Tetrahedron, 1992, 3069-3080], stir a suspension of 11.9 g (85% purity, 47.6 mmol) of 1-[(Z)-2-chloro-2-nitrovinyl]-4-ethylbenzene and 5.9 g (52.3 mmol) of 4,6-dihydroxypyrimidine in 200 ml of ethanol at 60-70° C. for 30 minutes. Then slowly add 14.4 ml (14.6 g, 96.1 mmol) of 1,8-diazabicyclo[5.4.0]undec-7-ene. Stir the resulting reaction solution under reflux for six hours and then at 60° C. for 15 hours. After concentration under reduced pressure, take up the residue in dichloromethane and chromatograph it on silica gel (eluent: cyclohexane/ethyl acetate 1:1→1:5). Stir the resulting solid in diethyl ether and filter. 5.0 g (44% of theory) of the target compound are obtained.
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