Asymmetric Henry reactions of aldehydes with various nitroalkanes catalyzed by copper(II) complexes of novel chiral<i>N</i>-monoalkyl cyclohexane-1,2-diamines
作者:Fei Liu、Shaohua Gou、Lei Li
DOI:10.1002/aoc.3107
日期:2014.3
2‐diamine (3g), the reaction was optimized in terms of the metal ion, temperature, solvent and base. Further experiments indicated that the complex, 3g–Cu(OAc)2, was an efficient catalyst in the asymmetricHenryreaction between different aldehydes and nitromethane, and the desired products have been obtained with high chemical yields (up to 99%) and high enantiomeric excess (up to 93%). The optimized catalyst
Enantioselective Henry and Aza-Henry Reaction in the Synthesis of (<i>R</i>)-Tembamide Using Efficient, Recyclable Polymeric Cu<sup>II</sup>Complexes as Catalyst
作者:Anjan Das、Manoj K. Choudhary、Rukhsana I. Kureshy、Tamal Roy、Noor-ul H. Khan、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1002/cplu.201402078
日期:2014.8
Chiral copper(II) polymeric [H4]salen (salen=bis[(salicylidene)ethylenediaminato]) complexes CuII‐1–3 were generated in situ and used as efficient catalysts in the asymmetric Henry and aza‐Henry reaction of various aromatic and aliphatic aldehydes and N‐tosylimines in the presence of various nitroalkanes at room temperature (27±2 °C) for 20 hours. This group of polymeric [H4]salen complexes demonstrated
手性铜(II)的聚合物[H 4 ]沙仑(沙仑=双[(亚水杨基)ethylenediaminato])配合物的Cu II -1 - 3原位产生和用作在不对称亨利有效的催化剂和各种芳族的氮杂-亨利反应在室温(27±2°C)下,在各种硝基烷存在下,脂肪族醛和N-甲苯基亚胺为20小时。这组聚合的[H 4 ] salen配合物通过使用低催化剂负载量为1 mol%(相对于单体salen)的硝基甲烷,在形成β-硝基醇方面表现出优异的性能(产品收率和对映体过量 ee高达98%)单位)和高对映体诱导(ee 94%)在aza-Henry产品中;以中等产率(78%)获得了β-硝胺。该催化系统也与硝基乙烷和亨利反应的情况下1-硝基丙烷运作良好,以提供在高收率和对映选择性的相应的产品顺式非对映体。该铜II -2复杂的克水平保持其性能,并在其性能没有显著损失方便回收的八倍。Cu II -2配合物对N的对映选择性氮杂-
Process for the Preparation of Metaraminol
申请人:LABORATORI ALCHEMIA S.R.L.
公开号:US20170210696A1
公开(公告)日:2017-07-27
Object of the invention is a process for the preparation of Metaraminol and the salts thereof, in particular its pharmaceutically acceptable salts, especially Metaraminol bi-L-tartrate. Object of the invention is also the use of a novel catalyst and a novel ligand for the synthesis of Metaraminol and its salts.
An easily available N,N′-dioxide/Cu(I) complex has been developed for the catalyticasymmetric nitroaldol (Henry) reaction of aldehydes with nitroethane. Under mild reaction conditions, a series of substituted aromatic, heteroaromatic and α,β-unsaturated aldehydes are transformed to the corresponding anti-β-nitroalcohols in good to excellent yields (up to 99%) with moderate to good dr (up to 16.7:1
已开发出一种易于获得的N,N'-二氧化物/ Cu(I)络合物,用于醛与硝基乙烷的催化不对称硝基醛醇(Henry)反应。下温和的反应条件下,一系列的取代的芳族,杂芳族和α,β -不饱和醛转化为相应的抗-β-硝基醇以良好至优异的产率(高达99%)的中度至良好博士(高达1670: 1 anti / syn)和高ee值(高达97%)。除硝基乙烷外,还使用硝基甲烷和1-硝基丙烷作为亲核试剂,并获得了良好的对映选择性。