By finely tuning the cavity volume of a coordination cage, the Diels–Alder reactivity of aromatic compounds was enhanced. Even unsubstituted naphthalene could be made to undergo the Diels–Alder reaction with N-tert-butylmaleimide, with perfectly controlled syn-selectivity. M6L4 cages with standard and contracted cavities had opposite effects on the reaction: the former favored larger Diels–Alder substrates, whereas the latter favored smaller ones.
通过精细调节配位笼的腔体体积,增强了芳香化合物的Diels–Alder反应性。即使是未取代的
萘也可以与N-叔丁基马来
酰亚胺发生Diels–Alder反应,并且实现了完全控制的顺式选择性。具有标准腔体和收缩腔体的M6L4笼对反应产生了相反的影响:前者更有利于较大的Diels–Alder底物,而后者则更有利于较小的底物。