Brønsted acid differentiated metal catalysis by kinetic discrimination
作者:Magnus Rueping、René M. Koenigs
DOI:10.1039/c0cc02167a
日期:——
A Brønsted acid differentiated metal catalyzed hydrogenation has been developed. A combinatorial variation of chiral triflylamides with achiral metal complexes results in a highly active catalyst for the asymmetric reduction.
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%。