synthetically versatile tetrahydroquinoline molecules with I2 and HBpin is described. In the presence of iodine (20 mol%) as a catalyst, reduction of quinolines and other N-heteroarenes proceeded readily with hydroboranes as the reducing reagents. The broad functional-group tolerance, good yields and mild reaction conditions imply high practical utility.
A highly efficient transfer hydrogenation of quinolines with Hantzsch ester as hydrogen source in the presence of 1 mol% Fe(OTf)2 under mild conditions has been developed. A series of substituted 1,2,3,4-tetrahydroquinoline derivatives were afforded in excellent yields with good functional group tolerance.
dehydrogenative coupling of benzocyclic amines with indolederivatives that enables to access various quinoline-indole linked N-biheteroarenes in an efficient manner. The catalytic transformation is characteristic of operational simplicity, a readily available catalyst system, good substrate and functional compatibility, mild conditions, high atom efficiency, and no need for oxidant and halogenated coupling agents
A revision of the literature on the nitration of tetrahydroquinolines yielded a number of inconsistencies. Thus, we have carried out a thorough study on the nitration of tetrahydroquinoline and several of its N-protected derivatives both experimentally and at theoretical level. Usually, nitration is carried out in acidic conditions and, thus, tetrahydroquinoline would be N-protonated; however, if the
关于四氢喹啉硝化的文献的修订产生了许多不一致之处。因此,我们在实验和理论水平上对四氢喹啉及其几种 N 保护衍生物的硝化进行了深入研究。通常,硝化是在酸性条件下进行的,因此四氢喹啉会被 N-质子化;然而,如果氨基被保护,中性系统将是进行硝化的系统。已经探索了不同的保护基团,不仅有电子和空间效应,而且还有脱保护条件。此外,还研究了不同的试剂和反应条件。从这项研究中,我们已经能够在 6 位实现硝化的总区域选择性。已经进行了非常详细的 NMR 研究以明确表征四种硝基异构体。同时,进行了与实验结果一致的计算研究。为此,通过使用 B3LYP/6-31++G ** 级别的计算,所有四种硝基异构体的中性和 N 质子化的 σ 配合物都在气相和水凝聚相中进行了优化。