SYNTHESIS OF 5-AMINO-1- ARYL-4-CYANOIMIDAZOLES FROMN-ARYL-N′-(1,2-DICYANOVINYL)- FORMAMIDINES
摘要:
The aryl-(Z)-N-[2-amino-1,2-dicyanovinyl]formandine cyclize in the presence of base to give a 1,5-diamino-4-cyanoimidazole or a 1,5-diamino-4-(cyanoformimidoyl)imidazole, depending on the reaction conditions and the nature of the base used to induced cyclization.
SYNTHESIS OF ARYL(OR BENZYL)-(Z)-<i>N</i>-[2-AMINO-1,2-DICYANOVINYL]FORMAMIDINES
作者:Asieh Yahya-Zadeh、Brian L. Booth
DOI:10.1081/scc-100107009
日期:2001.1
Starting from readily available ethyl(Z)-N-(2-amino-1,2-dicyanovinyl)formimidate (1), the N-aryl (or benzyl)-N′-(2-amino-1,2-dicyanovinyl)formamidines (2) can be prepared in good yields by reaction with aromatic amines at room temperature in the presence of a catalytic amount of anilinium hydrochloride.
Facile synthesis of 6-cyano-9-substituted-9H-purines and their ring expansion to 8-(arylamino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidines
作者:Amal Al-Azmi、Brian L. Booth、Robert A. Carpenter、Alice Carvalho、Elodie Marrelec、Robin G. Pritchard、M. Fernanda J. R. P. Proença
DOI:10.1039/b106539b
日期:2001.10.11
6-Cyano-9-substituted-9H-purines were prepared in a high yielding, one-step process by refluxing triethyl orthoformate or triethyl orthopropionate with the corresponding (Z)-N1-(aryl- or benzyl)-N2-(2-amino-1,2-dicyanovinyl)formamidines. Attempted reaction of these cyanopurines with aqueous methylamine furnished 8-(arylamino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidines, by attack at the imidazole ring rather than addition to the 6-cyano group. All compounds have been fully characterised by spectroscopic data and an X-ray crystal structure determination has been carried out on the 8-(4-methoxyanilino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidine.