作者:Hugh A. Hoather、James Raftery、Irem Yalavac、Eric J. Thomas
DOI:10.1016/j.tet.2015.04.101
日期:2015.6
were the major products isolated from Diels–Alder reactions of (2E,4E)-2,4-dimethylhexa-2,4-dienyl methyl fumarate and maleate and from the cyclisation of the all (E)-2,4,6,8-tetramethyldeca-2,4,6,8-tetraenyl methyl fumarate in contrast to the Diels–Alder reactions of analogous substrates that lack the dienyl 2-methyl group. All of these Diels–Alder reactions led to the introduction of a methyl bearing
该顺式-融合内酯来自(2的狄尔斯-阿尔德反应中分离的产品主要ë,4 ê)-2,4-二甲基己-2,4-二烯基甲基富马酸盐和马来酸盐,并从所有(的环化ë) -与没有二烯基2-甲基类似底物的狄尔斯-阿尔德反应相反,有2,4,6,8-四甲基癸基-2,4,6,8-四烯基富马酸甲酯。所有这些Diels–Alder反应导致引入了带有甲基的四元中心。3-(5,7-二甲基壬基-5,7-二烯酰基)吡咯啉酮的分子内Diels-Alder反应也主要产生内产物,在这种情况下,具有两个相邻的四级中心。