New Highly Asymmetric Henry Reaction Catalyzed by CuII and aC1-Symmetric Aminopyridine Ligand, and Its Application to the Synthesis of Miconazole
作者:Gonzalo Blay、Luis R. Domingo、Victor Hernández-Olmos、José R. Pedro
DOI:10.1002/chem.200800069
日期:2008.5.19
A new catalytic asymmetricHenryreaction has been developed that uses a C(1)-symmetric chiral aminopyridineligand derived from camphor and picolylamine. A variety of aromatic, heteroaromatic, aliphatic, and unsaturated aldehydes react with nitromethane and other nitroalkanes in the presence of DIPEA (1.0 equiv), Cu(OAc)(2)*H(2)O (5 mol %), and an aminopyridineligand (5 mol %) to give the expected
Synthesis of chiral salalen ligands and their in-situ generated Cu-complexes for asymmetric Henry reaction
作者:Ashish Dixit、Pramod Kumar、Surendra Singh
DOI:10.1002/chir.23019
日期:2018.12
Chiral salalen ligands derivedfrom (S)‐proline and derivatives of salicyaldehydes were synthesized, and their in‐situ generated Cu (II) complexes were evaluated in the asymmetric Henry reaction. Salalen ligand of different substituents on the phenyl moiety showed remarkable effect on the enantioselectivity of nitro‐aldol product of 4‐nitrobenzaldehyde and nitromethane. Cu (II) complex generated in
合成了衍生自(S)-脯氨酸和水杨醛衍生物的手性Salalen配体,并在不对称Henry反应中评估了它们原位生成的Cu(II)配合物。苯基部分上不同取代基的Salalen配体对4-硝基苯甲醛和硝基甲烷的硝基羟醛产物的对映选择性表现出显着影响。与(S)-2-(叔丁基)-6(((2-((((2-羟基-3-甲基苄基)氨基)甲基)吡咯烷烃-1-基)甲基)生成的Cu(II)络合物苯酚(10 mol%)和Cu(OAc)2 .H 2O(10 mol%)被发现是4-硝基苯甲醛与硝基甲烷之间硝基-羟醛反应的较好催化剂,40小时后,在35°C下,异丙醇中的相应产物收率为85%,对映体过量(ee)为88%。还以不同的取代的苯甲醛用于亨利反应的催化剂和相应的产物以22%至99%的产率和66%至92%的ee获得。4-硝基苯甲醛与前手性硝基乙烷的亨利反应产生抗选择性产物(dr = 79/21; anti / syn),收率为91%,ee为80%。
Copper Complex of Aminoisoborneol Schiff Base Cu
<sub>2</sub>
(SBAIB‐d)
<sub>2</sub>
: An Efficient Catalyst for Direct Catalytic Asymmetric Nitroaldol (Henry) Reaction
new bifunctional coppercomplex of the aminoisoborneolSchiffbase – Cu2(SBAIB‐d)2 – has been developed for the effective directcatalyticasymmetricHenryreaction. One mol% of this catalyst produces the expected Henry products in high yields (up to 99%) with excellent enantioselectivities (up to 98% ee). The utility of the present catalyst was also extended to the Henryreaction with nitroethane
Asymmetric Henry reactions catalyzed by metal complexes of chiral oxazoline based ligands
作者:A. Ebru Aydin、Seda Yuksekdanaci
DOI:10.1016/j.tetasy.2012.11.022
日期:2013.1
Chiral oxazolines have been synthesized from norephedrine and pyrrole nitrile or benzoyl chloride and applied to the catalytic asymmetricHenryreactions of p-nitro aldehydes with nitromethane to provide β-hydroxy nitroalkanols in high conversion (up to 92%). The reaction was then optimized in terms of the metal, solvent, temperature, and amount of chiralligand. The corresponding catalyst with Cu(OTf)2
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-