unfavorable entropy of macrocyclic closure allows undesired intermolecular reactions to compete. Here, we apply cavitands to the selective intramolecular aldol/dehydration reaction of long-chain α,ω-dialdehydes in aqueous solution. Hydrophobic forces drive the dialdehydes into the cavitands in folded conformations and favor macrocyclization reactions over intermolecular reactions observed in bulk solution
长链线性前体的传统端到端环化是困难的,并且通常是不可预测的,因为大环封闭的不利熵使得不希望的分子间反应竞争。在这里,我们将cavitands用于
水溶液中长链α,ω-二醛的选择性分子内羟醛/脱
水反应。疏
水力将二醛以折叠的构型驱入腔体中,并且比在本体溶液中观察到的分子间反应更有利于大环化反应。大范围的醛醇缩合反应产物在很宽的范围(11至17元环)上以良好的收率(30-85%)被分离出来。与传统模板在其组装主机中成为访客不同,