A series of 15 benzene-fused hexahydropyrrolo[1,2-b]isoquinolonic acids with substantial degree of steric encumbrance has been prepared via a novel variant of the Castagnoli-Cushman reaction of homophthalic anhydride (HPA) and various indolenines. The employment of a special kind of a cyclic imine component reaction allowed, for the first time, isolating a Mannich-type adduct between HPA and an imine
New Highly Diastereoselective Perkin/Michael Addition Domino Reaction between Homophthalic Anhydride and Aromatic Aldehydes: A Facile Approach to Blue-Fluorescent Dibenzo[c,h]chromenones
作者:Milen G. Bogdanov、Yavor Mitrev、Ioannis Tiritiris
DOI:10.1002/ejoc.201000879
日期:2011.1
A series of new trans-11-aryl-6-oxo-6H-dibenzo[c,h]chromene-12-carboxylic acids has been synthesised through a new Perkin/Michael addition domino reaction between homophthalic anhydride and aromatic aldehydes. The synthesis is straightforward and gives good overall yields by taking into account the concomitant formation of four C-C, C-O and C=C bonds. The structures of the newly synthesised compounds
一系列新的 trans-11-aryl-6-oxo-6H-dibenzo[c,h]chromene-12-羧酸已通过同邻苯二甲酸酐和芳香醛之间的新 Perkin/Michael 加成多米诺反应合成。考虑到四个 CC、CO 和 C=C 键的伴随形成,合成很简单,并给出了良好的总产率。新合成化合物的结构通过光谱方法( 1 H NMR、 13 C NMR和IR)和X射线衍射分析确定,并研究了荧光性质。提出了一种可能的反应机理,包括三个已证实的中间体。