Facile Synthesis of Polycyclic Aromatic Hydrocarbons: Brønsted Acid Catalyzed Dehydrative Cycloaromatization of Carbonyl Compounds in 1,1,1,3,3,3-Hexafluoropropan-2-ol
作者:Takeshi Fujita、Ikko Takahashi、Masaki Hayashi、Jingchen Wang、Kohei Fuchibe、Junji Ichikawa
DOI:10.1002/ejoc.201601406
日期:2017.1.10
The cycloaromatization of aromatic aldehydes and ketones was readily achieved by using a Bronsted acid catalyst in 1,1,1,3,3,3-hexafluoropropan-2-ol (HFIP). In the presence of a catalytic amount of trifluoromethanesulfonic acid, biaryl-2-ylacetaldehydes and 2-benzylbenzaldehydes underwent sequential intramolecular cationic cyclization and dehydration to afford phenacenes and acenes, respectively. Furthermore
通过在 1,1,1,3,3,3-六氟丙-2-醇 (HFIP) 中使用布朗斯台德酸催化剂,可以很容易地实现芳香醛和酮的环芳构化。在催化量的三氟甲磺酸存在下,联芳基-2-基乙醛和2-苄基苯甲醛依次进行分子内阳离子环化和脱水,分别得到非并苯和并苯。此外,在 α 位带有环戊烯部分的联芳基-2-基乙醛经历了前所未有的环芳构化,包括扩环以提供三亚苯。HFIP 通过抑制副反应有效地促进了环化,这可能是阳离子中间体稳定的结果。