[EN] PROCESSES FOR PREPARING DIHYDROPYRIMIDINE DERIVATIVES AND INTERMEDIATES THEREOF [FR] PROCÉDÉS DE PRÉPARATION DE DÉRIVÉS DE DIHYDROPYRIMIDINE ET D'INTERMÉDIAIRES DE CEUX-CI
在本文中,我们报告了一系列新型有机可溶物的合成,结构,形态和不对称催化性能 磷酸锆纳米复合材料及其负载的手性钌催化剂,在各种溶剂和介孔,丝状和层状结构中均具有良好的有机溶解度(0.1–0.5 g mL -1)。由于在各种有机溶剂中的有机可溶特性,在催化领域实现了膦酸锆负载的催化剂的第一次均质化。在取代的α-酮酯的不对称氢化中,对映选择性(74.3–84.7%ee)和分离的产率(86.7–93.6%)高于相应的均相Ru(p -cymene)(S -BINAP)Cl 2由于膦酸锆骨架中剩余的中孔引起的限制作用。反应完成后,通过添加可轻松以定量收率回收负载型催化剂环己烷 离心后再重复使用五次,而催化活性没有明显损失。
Enantioselective hydrogenation of pyruvates over polymer-stabilized and supported platinum nanoclusters
作者:Xiaobin Zuo、Hanfan Liu、Dawei Guo、Xiaozhen Yang
DOI:10.1016/s0040-4020(99)00415-9
日期:1999.6
cinchonidine-modified enantioselectivehydrogenation of pyruvates has been studied over polyvinylpyrrolidone-stabilized platinum (PVP-Pt) and the corresponding alumina-supported platinum (Al2O3-Pt) clusters. It is shown that the catalysts with particle size less than 2.0 nm demonstrate > 90% enantioselectivity in favor of (R)-lactates. The solvent effect is similar to that over the conventional supported platinum catalyst
已经在聚乙烯吡咯烷酮稳定的铂(PVP-Pt)和相应的氧化铝负载的铂(Al 2 O 3 -Pt)簇上研究了丙酮酸的辛可尼定修饰的对映选择性氢化。结果表明,粒径小于2.0 nm的催化剂表现出> 90%的对映选择性,有利于(R)-乳酸。除四氢呋喃外,其溶剂作用与常规负载铂催化剂相似。这些胶体和负载簇稳定,即使在室温下在空气中放置18个月也没有明显的活性和对映选择性损失。铂表面改性剂-反应物相互作用的分子力学计算表明,可以在小簇上获得良好的对映选择性。
Selective reductions. 37. Asymmetric reduction of prochiral ketones with B-(3-pinanyl)-9-borabicyclo[3.3.1]nonane
作者:Herbert C. Brown、G. Ganesh Pai
DOI:10.1021/jo00209a008
日期:1985.5
Chiral Aryl Iodide-Catalyzed Enantioselective α-Oxidation of Ketones
作者:Wesley Moran、Arantxa Rodríguez
DOI:10.1055/s-0031-1290590
日期:2012.4
Several chiral aryl iodides were synthesized and assessed as catalysts in the enantioselective alpha-oxytosylation of propiophenone and the oxidative cyclization of 5-oxo-5-phenylpentanoic acid to 5-benzoyldihydrofuran-2(3H)-one. The highest enantioselectivities obtained were 18 and 51% ee, respectively. The latter is the highest selectivity recorded to date for this reaction.
Chiral synthesis via organoboranes. 15. Selective reductions. 42. Asymmetric reduction of representative prochiral ketones with potassium 9-O-(1,2:5,6-di-O-isopropylidene-.alpha.-D-glucofuranosyl)-9-boratabicyclo[3.3.1]nonane
作者:Herbert C. Brown、Byung Tae Cho、Won Suh Park
DOI:10.1021/jo00241a021
日期:1988.3
Remarkable optical induction in the reduction of .alpha.-oxo esters with B-(3-pinanyl)-9-borabicyclo[3.3.1]nonane. Synthesis of .alpha.-hydroxy esters of 100% optical purity
作者:Herbert C. Brown、Ganesh G. Pai、Prabhakar K. Jadhav