Aminoacetaldehyde dimethyl acetal → HCID 10632760, Verbindung
Reaktionsgleichung
Cl[C:2]1[C:11](Cl)=[N:10][C:9]2[C:4](=[CH:5][C:6]([F:14])=[C:7]([F:13])[CH:8]=2)[N:3]=1.CO[CH:17]([O:20]C)[CH2:18][NH2:19]>>[F:13][C:7]1[CH:8]=[C:9]2[C:4](=[CH:5][C:6]=1[F:14])[N:3]1[CH:2]=[CH:11][N:19]=[C:18]1[C:17](=[O:20])[NH:10]2Komponenten
3
Versuchsvorschrift
By reacting 2,3-dichloro-6,7-difluoroquinoxaline with aminoacetaldehyde dimethyl acetal, following a procedure that is similar to that described in example 1, there is obtained 7,8-difluoroimidazo[1,2-a]quinoxalin-4(5H)-one (m.p. >300° C.) and, subsequently, 4-chloro-7,8-difluoroimidazo[1,2-]quinoxaline. By reacting this product with cyclopentylamine according to the method described in example 3, there is obtained 4-cyclopentylamino-7,8-dichloroimidazo[1,2-a]quinoxaline. m.p. (DSC)=146.0° C.(onset); IR (KBr): 3263, 2955, 1554 cm-1 ; 1H-NMR (CDCl3): δ7.7 (1H,s), 7.65÷7.15 (3H,m), 6.1 (1H,d), 4.6 (1H,m), 2.3÷1.3 (8H,m); UV (EtOH): λmax =225, 241, 270, 295, 323, 337 nm. Elementary analysis for C15H14F2N4 (m.w. 288.30): calcd. C 62.49, H 4.89, N 19.43%; found C 62.46, H 5.03, N 19.65%.