Versatilite de reactivite de l`acetylene dicarbaldehyde et des aldehydes α-acetyleniques a l'egard des dienes conjugues cycliques et heterocycliques en milieu acide
作者:A. Gorgues、A. Simon、A. Le Coq、A. Hercouet、F. Corre
DOI:10.1016/s0040-4020(01)87436-6
日期:1986.1
of acetylenedicarbaldehyde and the corresponding mono acetal is described. A comparison of their reactivity with other α-acetylenic aldehydes R-CC-CHO to towards conjugated cydic or hetero- cydic dienes is presented. Under neutral conditions, the only expected Diels-Alder adducts are formed. Under acidic conditions (HCO2H, CF3,CO2H or eventually AcOH) they afford the only Diel-Alder adduct when the
描述了乙炔二甲醛和相应的单缩醛的制备。它们与其它α-炔醛RCC-CHO的反应性的比较来向共轭cydic或异cydic二烯被呈现。在中性条件下,仅形成预期的Diels-Alder加合物。在酸性条件下(HCO 2 H,CF 3,CO 2 H或最终为AcOH),当环丁二烯不表现出任何芳族特征时,它们会提供唯一的Diel-Alder加合物,而在相反的情况下,Michael加成物或多或少重要数量; 从呋喃开始,还可以观察到第三个途径来处理双亲电子取代化合物的形成。的机制进行了讨论和特别地,共用偶极的中间为竞争形成建议帐户和。