Lewis Acid-Catalyzed Cyclotrimerization of Methyl 3-Acetylazulene-1-carboxylate in Alcohols
作者:Satoko Yamashiro、Kimiaki Imafuku
DOI:10.1081/scc-120022162
日期:2003.1.8
An alcoholic solution of methyl 3-acetylazulene-1-carboxylate was treated with tetrachlorosilane, titanium(IV) chloride, thionyl chloride, and so on, at room temperature to give l,3,5-tri(1-azulenyl)benzenes. It was found that thionyl chloride is useful for triple condensation. A dimeric intermediate, 1,3-bis(3-methoxycarbonyl-1-azulenyl)-2-buten-1-one, was also isolated. Its reaction with the starting monomer gave the trimeric I,3,5-tri(l-azulenyl)benzene.