We report the design of a catalytic, bifunctional template that binds heterocyclic substrate via reversible coordination instead of covalent linkage, allowing remote site-selective C—H olefination of heterocycles. The two metal centers coordinated to this template play different roles; anchoring substrates to the proximity of catalyst and cleaving the remote C—H bonds respectively. Using this strategy, we demonstrate remote site-selective C—H olefination of heterocyclic substrates which do not have functional group handles for covalently attaching templates. For instance the olefination can be an alkenylation of a 3-phenylpyridine with an acrylate alkyl ester selective for the meta position of the phenyl group with respect to the pyridine, or can be an alkenylation of a quinoline with an acrylate alkyl ester selective for the 5-position of the quinoline.
我们报告了一种催化双功能模板的设计,该模板通过可逆配位而非共价连接结合杂环基质,从而实现杂环的远位选择性 C-H 烯化。与该模板配位的两个
金属中心扮演着不同的角色:分别将底物锚定在催化剂附近和裂解远程 C-H 键。利用这种策略,我们展示了杂环基质的远程位点选择性 C-H 烯化反应,这些基质不具有共价连接模板的官能团柄。例如,烯化反应可以是
3-苯基吡啶与
丙烯酸酯烷基酯的烯化反应,选择性地针对苯基相对于
吡啶的元位置;也可以是
喹啉与
丙烯酸酯烷基酯的烯化反应,选择性地针对
喹啉的 5-位置。