Synthesis of 1,1′-, 2,2′-, 1,2′-, and 2,6′-Biazulenes and Their Derivatives by Ullmann Reaction
作者:Tadayoshi Morita、Kahei Takase
DOI:10.1246/bcsj.55.1144
日期:1982.4
Four kinds of biazulenes, 1,1′- (1a), 2,2′- (2a), 1,2′- (3a), and 2,6′-biazulenes (4a), and their derivatives were synthesized by utilizing Ullmann-type coupling of haloazulene derivatives. Ullmann reaction of ethyl 3-iodo-(5a) and 2-iodoazulene-1-carboxylates (6b) gave diethyl 1,1′-biazulene-3,3′-dicarboxylate (1b) and diethyl 2,2′-biazulene-1,1′-dicarboxylate (2b), respectively, in excellent yields
1,1'- (1a), 2,2'- (2a), 1,2'- (3a), 2,6'-双脒(4a) 4种及其衍生物合成卤代芘衍生物的乌尔曼型偶联。3-碘-(5a) 和 2-iodoazulene-1-carboxylates (6b) 的 Ullmann 反应得到 1,1'-biazulene-3,3'-dicarboxylate (1b) 和 2,2'-biazulene-1 二乙酯,1'-二羧酸盐 (2b),分别以极好的收率。2-碘芴反应直接得到2a。二乙基 2-chloroazulene-1,3-dicarboxylate (7a) 和它的 5-烷基衍生物也反应得到四乙基 2,2'-biazulene-1,1',3,3'-tetracarboxylate (2d) 和它的 5,分别为 5'-二烷基衍生物。5a 和 6b 的混合 Ullmann 反应提供了 1b、2b 和 1,2'-联茚-1'