On the reaction of azulen-2-ylmethylene(triphenyl)phosphorane. Convenient preparation of azuleno[1,2-f ]- and azuleno[1,2-a]-azulenes and their properties
作者:Tohru Takayasu、Makoto Nitta
DOI:10.1039/a702716h
日期:——
The reaction paths involve the Michael-type addition of 9 onto 10 and 14, subsequent proton migration to regenerate the phosphorane moiety, intramolecular condensation of the formyl and carbonyl groups (Wittig reaction) and aromatization. In order to gain insight into the mechanism, PM3 calculations on compounds 9, 10 and 14 as well as on the related compound, (azulen-2-ylimino)tributylphosphorane,
新型的Azulen-2-基甲基(三苯基)溴化phosph已被证明是一种快速合成新环的合成子,导致形成azulenoazulenes。的碱处理鏻溴化物产生的薁-2- ylmethylenephosphorane 9原位和随后的反应用5-(二甲氨基亚甲基)环戊二烯-1,3- dienecarbaldehyde 10和2- chlorotropone 14次,得到未经取代的azuleno [1,2 ˚F ] -和阿苏莱诺[1,2- a] -azulenes 1和2。还进行了9与2-氯-3,5,7-三苯并异戊四烯酮的反应,以阐明导致形成2的反应路径。该反应路径涉及将9的迈克尔型加成到10和14上,随后质子迁移以再生磷烷部分,甲酰基和羰基的分子内缩合(维蒂希反应)和芳构化。为了深入了解该机理,已对化合物9、10和14以及相关化合物(azulen-2-ylimino)三丁基磷烷进行了PM3计算。基于前