benzoquinones, where the dienophilic moiety is imbedded in an isosteric environment, can be modulated by a remote olefinic bond and a cyclopropane ring. Quantum mechanical calculations while reproducing the observed diastereoselectivities at the TS level indicate the involvement of ground state orbital effects.
特制的
双环[2.2.2]辛烷稠合的苯醌之间的狄尔斯-阿尔德反应中的π-面选择性,可以通过远程烯烃键和
环丙烷环来调节,其中双亲性部分嵌入等排环境中。在
TS级别重现观察到的非对映选择性的同时进行的量子力学计算表明基态轨道效应的参与。