H. Yoshioka et al., SYNTHESIS OF THE INTERFERON-ALPHA INDUCER IMIQUIMOD BY THERMAL ELECTROCYCLIC REACTIONS OF 1-AZAHEXATRIENE AND 2-AZAHEXATRIENE SYSTEMS, Chemical and Pharmaceutical Bulletin, 44(4), 1996, pp. 709-714
The interferon-1 inducer imiqnimod (1), possessing an imidazo[4,5-c]qu
inoline ring, has been newly synthesized by two routes based on therma
l electrocyclic reactions of 1- and 2-azahexatriene systems involving
the imidazole 4,5-bond.