Manganese‐Catalyzed Asymmetric Hydrogenation of Quinolines Enabled by π–π Interaction**
作者:Chenguang Liu、Mingyang Wang、Shihan Liu、Yujie Wang、Yong Peng、Yu Lan、Qiang Liu
DOI:10.1002/anie.202013540
日期:2021.3
The non‐noble metal‐catalyzed asymmetric hydrogenation of N‐heteroaromatics, quinolines, is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of quinolines, affording high yields and enantioselectivities (up to 97 % ee). A turnover number of 3840 was reached at a low catalyst loading (S/C=4000), which is competitive with the activity
报道了非贵金属催化的N-杂芳族化合物喹啉的不对称氢化。一种新型手性钳式锰催化剂在喹啉的不对称氢化中表现出出色的催化活性,提供了高收率和对映选择性(高达97%ee)。在低催化剂负载量(S / C = 4000)下,达到了3840的周转率,与该反应中最有效的贵金属催化剂的活性相竞争。对映选择性的精确调节通过π-π相互作用来保证。
Exploration of chiral diastereomeric spiroketal (SPIROL)-based phosphinite ligands in asymmetric hydrogenation of heterocycles
作者:Siyuan Sun、Pavel Nagorny
DOI:10.1039/d0cc03088k
日期:——
best ligands for these transformations, the (S,R,R)-diastereomer of SPIRAPO was found to be highly effective ligand for the reduction of 20 different heterocyclic systems with loadings as low as S/C = 10 000. This dearomatizative hydrogenation provided direct access to optically active tetrahydroquinolines in high enantioselectivities (up to 94% ee) and excellent yields (up to 99%), and was used to
已经制备了新的和容易获得的基于手性SPIROL的二亚膦酸酯配体(SPIRAPO),并将其用于铱催化的喹啉,喹喔啉和2 H -1,4-bezoxazin-2-ones的不对称氢化。虽然结构相似的(R,R,R)-SPIRAPO和(R)-SPINOL基亚膦酸酯不是这些转化的最佳配体,但(S,R,R发现SPIRAPO的)-非对映异构体是还原20个不同S / C = 10000负载的不同杂环系统的高效配体。这种脱芳香化氢化反应可直接获得高对映选择性(高达94%的光学活性四氢喹啉) ee)和极佳的收率(高达99%),并用于生成1.75 g天然生物碱(-)-(R)-鸟苷。该方案随后被扩展以实现喹喔啉和2 H -1,4-苯并恶嗪-2-酮的不对称氢化,具有良好至优异的对映选择性。
Strong Brønsted acid promoted asymmetric hydrogenation of isoquinolines and quinolines catalyzed by a Rh–thiourea chiral phosphine complex via anion binding
Rhodium catalyzed asymmetrichydrogenation of both isoquinolines and quinolines provides a new method to synthesize chiral tetrahydroisoquinolines and tetrahydroquinolines. By introducing strong Brønsted acid HCl, anion binding between the substrate and the ligand was established to achieve high reactivity and high enantioselectivity (up to 99% conversion and 99% ee). An NMR study suggests an anion
Iridium-Catalyzed Asymmetric Hydrogenation of Quinoline Derivatives with C3*-TunePhos
作者:Fa-Rong Gou、Wei Li、Xumu Zhang、Yong-Min Liang
DOI:10.1002/adsc.201000485
日期:2010.10.4
A series of C3*-TunePhos chiral diphosphine ligands has been successfully applied in the iridium-catalyzed enantioselective hydrogenation of quinolines, and this methodology provided an efficient access to a variety of optically active tetrahydroquinolines with up to 93% ee. Furthermore, attempts on the asymmetrichydrogenation of quinoline N-oxide are also discussed.
of manganese-catalyzed asymmetric transfer hydrogenation of N-heteroaromatics in water is reported. This ATH reaction proceeds smoothly without the need for inert atmosphere protection in the presence of a water-stable manganese catalyst, which bears an easily available aminobenzimidazole ligand. Ammonia borane, regarded as a green, cheap and high atom economical hydrogensource, was applied. Various
报道了锰催化 N-杂芳烃在水中不对称转移氢化的第一个例子。该 ATH 反应在水稳定的锰催化剂存在下顺利进行,无需惰性气氛保护,该催化剂带有易于获得的氨基苯并咪唑配体。氨硼烷被认为是一种绿色、廉价、高原子经济的氢源。各种喹啉以高产率转化为所需产品,对映体过量 (ee) 高达 99%。当前方案的实用性通过将其应用于汉考克生物碱 (−)-cuspareine 的克级全合成来证明,总产率为 96%。