18731-47-0Relevant articles and documents
Synthesis of N,O-type inherently chiral calix[4]arenes substituted on the lower rim and their organocatalysis properties
Chang, Ming-Liang,He, Yong,Zhou, Jing,Li, Shao-Yong
, p. 1363 - 1370 (2017)
This work presented the first study of organocatalytic behaviors of inherently chiral calix[4] arenes substituted at the lower rim. A pair of N,O-type enantiomers based on inherently chiral calix[4]arenes substituted at the lower rim were readily synthesi
In search of enantioselective catalysts for the Henry reaction: Are two metal centres better than one?
Constable, Edwin C.,Zhang, Guoqi,Housecroft, Catherine E.,Neuburger, Markus,Schaffner, Silvia,Woggon, Wolf-D.
, p. 1064 - 1069 (2009)
Catalysts for the asymmetric Henry reaction involving copper(ii) complexes of the chiral Schiff bases N,N′-(1R,2R)-(-)-1,2-cyclohexylenebis(3- hydroxysalicylideneamine) (H21) and N,N′-(1R,2R)-(-)-1,2- cyclohexylenebis(3-ethoxysalicylideneamine)
Not all nitrogen atoms are equal: Contribution of peripheral versus internal amines to the observed reactivity and capture properties of melamine dendrons on SBA-15
Lou,Shantz
, p. 567 - 570 (2018)
The role of different nitrogen atoms in melamine dendrons tethered to SBA-15 is elucidated. For the nitroaldol (Henry) reaction all nitrogen atoms of the capping group participate in the reaction. For metal binding, uptake correlates with the diamine cont
New chiral CuII complexes and their catalytic activity in enantioselective Henry reaction
Veselovsky,Zlokazov
, p. 440 - 444 (2016)
New chiral polydentante ligands capable of complexation of Cu2+ ions were synthesized using readily available derivatives of (S)-proline, d-glyceraldehyde, and imidazole as the starting materials. The synthesized complexes are efficient catalys
Phenylalanine-Derived Imidazolines Bearing Heteroaromatic Pendants: Synthesis, Characterization, and Application in the Asymmetric Henry Reaction
Tydlitát, Ji?í,Bure?, Filip,R??i?ková, Zdeňka
, p. 1351 - 1363 (2015)
Starting from L-phenylalanine, (2S)-3-phenylpropane-1,2-diamine has been prepared and used as building block for the construction of the imidazoline ring. Four new optically pure NH-imidazolines bearing different six-membered heteroaromatic substituents o
Novel nitrogen ligands based on imidazole derivatives and their application in asymmetric catalysis
Bures, Filip,Szotkowski, Tomas,Kulhanek, Jiri,Pytela, Oldrich,Ludwig, Miroslav,Holcapek, Michal
, p. 900 - 907 (2006)
Recently prepared chiral amines have been used in the preparation of novel tridentate ligands based on an imidazole ring with an additional (hetero)ring. The synthesis was carried out by the reaction of chiral amines with suitable aldehydes (2-phenylimida
Catalytic properties of dendron-OMS hybrids
Wang, Qingqing,Guerrero, Victor Varela,Ghosh, Anirban,Yeu, Seunguk,Lunn, Jonathan D.,Shantz, Daniel F.
, p. 15 - 25 (2010)
The synthesis and catalytic testing of several dendron-ordered mesoporous silica hybrids are reported. These materials are active in both the nitroaldol (Henry) reaction and the transesterification of glyceryl tributyrate to afford methyl esters. In both reactions it is observed that dendrons terminated with primary amines are more catalytically active than samples containing dendrons terminated with secondary amines. On a mmol nitrogen per gram of silica basis, the first generation dendrons are the most active for both chemistries, and the SBA-15 samples display a higher activity than the MCM-41 samples. The pore-size effect observed is consistent with significant diffusion resistance in the MCM-41 samples. The activity trend observed in the SBA-15 materials is consistent with decreased cooperative effects between the amines and surface silanols as the dendrons become larger. Clear trends are observed indicating that higher generation dendrons are more selective to alcohol formation in the Henry reaction. The dendron catalysts are much more active and stable than simple amines attached to silica in the transesterification of triglycerides. Preliminary results shown indicate that these materials can also catalyze more demanding chemistries, an example of which is the Aldol condensation of 5-(hydroxymethyl)furfural and acetone. The results shown indicate that dendron-OMS hybrids can serve as effective solid base catalysts for a diverse range of chemistries.
NIR luminescence and catalysis of multifarious salen type ytterbium complexes modulated by anions
Zou, Xiaoyan,Yan, Pengfei,Zhang, Juwen,Zhang, Fengming,Hou, Guangfeng,Li, Guangming
, p. 13190 - 13199 (2013)
A series of five N,N′-bis(2-hydroxy-3-methoxybenzylidene)-1,3- propanediamine (H2L) ytterbium complexes, namely, [Yb(H 2L)2(CH3OH)](ClO4)3 (1), [Yb(H2L)(NO3)3/su
General acid and base bifunctional graphene oxide for cooperative catalysis
Zhang, Wenfeng,Gu, Hanying,Li, Zhen,Zhu, Yuanzhi,Li, Yang,Zhang, Guoliang,Zhang, Fengbao,Fan, Xiaobin
, p. 10239 - 10243 (2014)
In this study, a bifunctional graphene oxide material (GO-AEP-UDP) with a general acid, the ureidopropyl (UDP) group, and a general base, the 3-[2-(2-aminoethylamino)ethylamino]-propyl (AEP) group, was synthesized by silylanization of graphene oxide (GO)
Revisit to Henry reaction by non conventional heterogeneous and efficient catalyst for nitroalcohol synthesis
Jadhav, Swati D.,Patil, Rupesh C.,Jagdale, Ashutosh A.,Patil, Suresh S.
, p. 593 - 606 (2021/11/03)
A sustainable, green and efficient process for the synthesis of 2-nitro alcohol derivatives from different substituted aromatic aldehydes with nitroalkane by stirring at ambient temperature with high product yield is reported. Adoption of very mild reaction conditions, use of Calcined Eggshell (CES) as natural catalyst and simple workup are expected to contribute to the development of environmentally benign synthetic method for Henry (nitroaldol) reaction. CES is ecologically safe, inexpensive, and attractive heterogeneous base catalyst obtained from renewable resources, thus opening a new perspective for this process. Graphical abstract: [Figure not available: see fulltext.]
