作者:Amit A. Kudale、David O. Miller、Louise N. Dawe、Graham J. Bodwell
DOI:10.1039/c1ob05867c
日期:——
A series of pentacyclic heterocyclic systems (15 examples, 69–89%) have been synthesized using intramolecular Povarov reactions involving 3-aminocoumarins and O-cinnamylsalicylaldehydes. The Povarov adducts are formed with high selectivity for the trans,trans relative stereochemistry in the newly-formed [6,6] fused ring system. One example of a Povarov adduct featuring a new [6,5] fused ring system is reported. In this case, cis,trans relative stereochemistry was preferred.
利用3-氨基香豆素与O-肉桂基水杨醛之间的分子内Povarov反应,合成了一系列五环杂环体系(15个例子,69-89%)。Povarov加合物在新形成的[6,6]并环体系中高度选择性地形成了反,反相对立体化学结构。此外,报道了一个具有新[6,5]并环体系的Povarov加合物例子,在这个例子中,顺,反相对立体化学结构被优先形成。