Synthesis and some properties of 7H-naphth[3,2,1-cd ]azulen-7-ones and related compounds
作者:Noritaka Abe、Hiroyuki Fujii、Kahei Takase、Tadayoshi Morita
DOI:10.1039/b101333p
日期:——
7H-Naphth[3,2,1-cd]azulen-7-ones are synthesized by the intramolecular Friedel–Crafts cyclization of diethyl 4-phenylazulene-1,3-dicarboxylate derivatives with polyphosphoric acid (PPA). Treatment of 7H-naphth[3,2,1-cd]azulen-7-one with methyl trifluoromethanesulfonate or perchloric acid gives 7-methoxynaphth[3,2,1-cd]azulenium trifluoromethanesulfonate or 7-hydroxynaphth[3,2,1-cd]azulenium perchlorate. Both spectroscopic inspection and molecular orbital calculations for 7-hydroxynaphth[3,2,1-cd]azulenium ion show that the tropylium moiety is a main contributor to the ground state in the resonance structure. The syntheses of 7H-azuleno[1,8-bc]phenanthren-7-ones and 5,7-dihydrodinaphth[3,2,1-cd:1′,2′,3′-ij]azulene-5,7-diones are also described.
7H-Naphth[3,2,1-cd]azulen-7-ones 是通过 4-苯基薁-1,3-二甲酸二乙酯衍生物与多磷酸 (PPA) 的分子内 Friedel-Crafts 环化反应合成的。用三氟甲磺酸甲酯或高氯酸处理 7H-萘并[3,2,1-cd]偶氮烯-7-酮,可得到 7-甲氧基萘并[3,2,1-cd]偶氮鎓三氟甲磺酸盐或 7-羟基萘并[3,2,1-cd]偶氮鎓高氯酸盐。7-hydroxynaphth[3,2,1-cd]azulenium 离子的光谱检测和分子轨道计算均表明,在共振结构中,tropylium 分子是基态的主要贡献者。此外,还介绍了 7H-氮烯并[1,8-bc]菲-7-酮和 5,7-二氢二萘并[3,2,1-cd:1′,2′,3′-ij]氮烯-5,7-二酮的合成。