A General and a Simple Synthesis of {4-[( Z )-4-(Arylimino)-3,4-Dihydroquinazolin-2(1 H )-Ylidene]Cyclohexa-2,5-Dien-1-Ylidene} Malononitrile from the Reaction of 2-Amino-N′-Arylbenzimidamides with 7,7,8,8-Tetracyanoquinodimethane

A short and facile synthesis of a series of {4-[(Z)-4-(arylimino)-3,4-dihydroquinazolin-2(1H)-ylidene]cyclohexa-2,5-dien-1-ylidene}malononitrile was accomplished in moderate to good yields via Charge-transfer complexes between 2-amino-N′-aryl-benzimidamide derivatives and 7,7,8,8-tetracyanoquinodimethane. The structure of the products were established on the basis of their elemental analysis, IR, NMR (¹H and ¹³C) and mass spectrometry data.