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.
spectroscopy, the synthesized material is composed of Fe(0), Fe3C and FeNx in a N-doped carbon matrix. The decent catalytic activity of this robust and easily recyclable Fe-material allowed for the selective hydrogenation of various (iso)quinoline derivatives, even in the presence of reducible functional groups, such as nitriles, halogens, esters and amides. For a proof-of-concept, this nanostructured
通过应用氮掺杂碳改性铁基催化剂,实现了N-杂芳烃,特别是(异)喹诺酮类化合物的受控加氢。活性的关键是通过热解碳浸渍复合材料制备催化剂,该复合材料由乙酸铁( II )和N-芳基亚氨基吡啶获得。 TEM、XRD、XPS 和拉曼光谱表明,合成的材料由 N 掺杂碳基体中的 Fe(0)、Fe 3 C 和 FeN x组成。这种坚固且易于回收的铁材料具有良好的催化活性,即使在存在可还原官能团(例如腈、卤素、酯和酰胺)的情况下,也可以选择性氢化各种(异)喹啉衍生物。为了进行概念验证,这种纳米结构催化剂被应用于天然产物和药物先导化合物的多步合成以及光致发光材料的改性中。因此,该方法构成了具有合成重要性的取代(异)喹诺酮的第一个非均相铁催化氢化。
Boric acid catalyzed chemoselective reduction of quinolines
作者:Dipanjan Bhattacharyya、Sekhar Nandi、Priyanka Adhikari、Bikash Kumar Sarmah、Monuranjan Konwar、Animesh Das
DOI:10.1039/c9ob02673h
日期:——
Boricacid promoted transfer hydrogenation of substituted quinolines to synthetically versatile 1,2,3,4-tetrahydroquinolines (1,2,3,4-THQs) was described under mild reaction conditions using a Hantzsch ester as a mild organic hydrogen source. This methodology is practical and efficient, where isolated yields are excellent and reducible functional groups are well tolerated in the N-heteroarene moiety
Core‐Shell Nano‐Cobalt Catalyzed Chemoselective Reduction of N‐Heteroarenes with Ammonia Borane
作者:Sanxia Chen、Wenxuan Xue、Conghui Tang
DOI:10.1002/cssc.202201522
日期:2022.12.7
Awesome to the core: A core-shell nano-cobalt catalyst was reported for the chemoselective reduction of N-heteroarenes with ammonia borane under mild conditions, various N-heteroarenes including bioactive compounds were hydrogenated smoothly, and reduction sensitive functional groups such as cyano, ester, and halogens were well-tolerated. This novel method was applied in the synthesis of medicinally
Awesome to the core:一种核-壳纳米钴催化剂被报道用于在温和条件下用氨硼烷化学选择性还原N-杂芳烃,包括生物活性化合物在内的各种N-杂芳烃被顺利加氢,还原敏感的官能团如氰基,酯和卤素的耐受性良好。这种新方法也被应用于具有重要药用价值的分子和有机储氢系统的合成。
Transfer Hydrogenation of N- and O-Containing Heterocycles Including Pyridines with H<sub>3</sub>N–BH<sub>3</sub> Under the Catalysis of the Homogeneous Ruthenium Precatalyst
作者:Tarun Bhatt、Kishore Natte
DOI:10.1021/acs.orglett.3c04051
日期:2024.2.2
hydrogenation protocol that utilizes borane–ammonia (H3N–BH3) as the hydrogen source and a commercially available RuCl3·xH2O precatalyst for the selective aromatic reduction of quinolines, quinoxalines, pyridines, pyrazines, indoles, benzofurans, and furan derivatives to form the corresponding alicyclic heterocycles in good to excellent isolated yields. Applications of this straightforward protocol include
在本研究中,我们报告了一种转移氢化方案,该方案利用硼烷-氨(H 3 N–BH 3 )作为氢源和市售RuCl 3 · x H 2 O预催化剂用于喹啉、喹喔啉、吡啶的选择性芳族还原、吡嗪、吲哚、苯并呋喃和呋喃衍生物形成相应的脂环族杂环,分离收率良好至优异。这种简单方案的应用包括有效制备有用的关键药物中间体,例如多奈哌齐和氟甲喹,包括生物活性化合物。