Highly<i>Syn</i><i>π</i>-Facial Preference in the Diels-Alder Reactions of 1,2,3,4,5-Pentamethylcyclopentadienes Having Carboxy, Ethoxycarbonyl, and Cyano Substituents at 5-Positions
作者:Masaru Ishida、Shingo Tomohiro、Minako Shimizu、Satoshi Inagaki
DOI:10.1246/cl.1995.739
日期:1995.8
Diels-Alder reactions of 1,2,3,4,5-pentamethylcyclopentadienes having carboxy, alkoxycarbonyl, and cyano substituents at 5-positions with N-phenylmaleimide preferentially afforded the corresponding syn-attack products with the ratio of syn/anti = 80 : 20 to 100 : 0, while the diene having 5-hydroxymethyl moiety gave the anti-attack product exclusively.
在 5 位具有羧基、烷氧基羰基和氰基取代基的 1,2,3,4,5-五甲基环戊二烯与 N-苯基马来酰亚胺的 Diels-Alder 反应优先提供相应的顺/反比 = 80 的顺攻击产物: 20 到 100 : 0,而具有 5-羟甲基部分的二烯仅提供抗攻击产品。