Chiral-at-metal iridium complex for efficient enantioselective transfer hydrogenation of ketones
作者:Cheng Tian、Lei Gong、Eric Meggers
DOI:10.1039/c6cc00972g
日期:——
A bis-cyclometalated iridium(III) complex with metal-centered chirality catalyzes the enantioselectivetransferhydrogenation of ketones with high enantioselectivities at low catalyst loadings down to 0.002 mol%. Importantly, the rate of catalysis...
Highly Enantioselective Transfer Hydrogenation of Prochiral Ketones Using Ru(II)-Chitosan Catalyst in Aqueous Media
作者:György Szőllősi、Vanessza Judit Kolcsár
DOI:10.1002/cctc.201801602
日期:2019.1.23
Unprecedentedly high enantioselectivities are obtained in the transferhydrogenation of prochiral ketones catalyzed by a Ru complex formed in situ with chitosan chiral ligand. This biocompatible, biodegradable chiral polymer obtained from the natural chitin afforded good, up to 86 % enantioselectivities, in the aqueous‐phase transferhydrogenation of acetophenone derivatives using HCOONa as hydrogen donor. Cyclic
在与壳聚糖手性配体原位形成的Ru络合物催化的前手性酮的转移氢化中,获得了前所未有的高对映选择性。这种从天然几丁质中获得的生物相容性,可生物降解的手性聚合物,在使用HCOONa作为氢供体的苯乙酮衍生物的水相转移氢化中,提供了高达86%的良好对映选择性。环酮的对映选择性更高,超过90%,而在杂环酮的转移氢化中,进一步增加,最高可达97%。手性催化剂前体制备易地通过扫描电子显微镜,FT-中期和-far-IR光谱法检测。原位结构通过1 H NMR光谱和使用各种壳聚糖衍生物研究了形成的催化剂。结果表明,Ru预催化剂是通过氨基将生物聚合物与金属配位而形成的。加入氢供体后,该前体转化为水不溶性钌氢化物络合物。通过以高收率和光学纯度制备二十多种手性醇,验证了所开发方法的实用价值。在单次结晶后,将催化剂用于以克为单位获得光学纯的手性醇。
A remarkably effective catalyst for the asymmetric transfer hydrogenation of aromatic ketones in water and air
complex generated in situ from [Cp*RhCl2]2 and (1R,2R)-N-(p-toluenesulfonyl)-1,2-cyclohexanediamine (TsCYDN) serves as a remarkably effective, robust catalyst for the asymmetrictransferhydrogenation of aromaticketones by HCOONa in water in air, affording alcohols in up to 99% ee.
Highly Enantioselective Transfer Hydrogenation of Ketones with Chiral (NH)<sub>2</sub>P<sub>2</sub>Macrocyclic Iron(II) Complexes
作者:Raphael Bigler、Raffael Huber、Antonio Mezzetti
DOI:10.1002/anie.201501807
日期:2015.4.20
Bis(isonitrile) iron(II) complexes bearing a C2‐symmetric diamino (NH)2P2 macrocyclic ligand efficiently catalyze the hydrogenation of polar bonds of a broad scope of substrates (ketones, enones, and imines) in high yield (up to 99.5 %), excellent enantioselectivity (up to 99 % ee), and with low catalyst loading (generally 0.1 mol %). The catalyst can be easily tuned by modifying the substituents of
带有C 2对称的二氨基(NH)2 P 2大环配体的双(异腈)铁(II)络合物可以高产率(上)高效催化广泛范围内底物(酮,烯酮和亚胺)的极性键氢化。至99.5%(99.5%ee),优异的对映选择性(高达99%ee),并且催化剂负载量低(通常为0.1 mol%)。通过修饰异腈配体的取代基可以容易地调节催化剂。
Highly Enantioselective Addition of Me<sub>2</sub>Zn to Aldehydes Catalyzed by ClCr(Salen)
作者:Pier Giorgio Cozzi、Peter Kotrusz
DOI:10.1021/ja057969d
日期:2006.4.1
enantiomeric excesses are obtained in the addition of Me2Zn catalyzed by commercially available ClCr(Salen). Broad scope, simple procedure, room temperature, low catalyst loading are the characteristics of this new enantioselective process, which uses the rather unreactive Me2Zn. Enantiomeric excesses in the range of 71-99% are obtained with all the aldehydes tested.