Hybrid polyoxometalate palladacycles: DFT study and application to the Heck reaction
摘要:
The phosphovanadotungstate polyanion [P2W15V3O62](9-) is a powerful support to stabilize palladacycles conjugated to the inorganic framework via an organic ligand. The insertion can be directed toward sp(2) or sp(3) C-H insertion upon appropriate choice of the substitution pattern on the organic ligand. OFT modeling indicates that the strong withdrawing effect of the POM transmitted through the conjugated carbonyl was responsible for this easy insertion. The palladacycles led to the formation of stilbene via a Mizoroki-Heck reaction. However it is likely that the POMs act as Pd-reservoirs for the formation of nanoparticles. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of Optically Active Oxazoline Derivatives via Catalytic Asymmetric Desymmetrization of 1,3-Diols
作者:Yutaro Tsuda、Masami Kuriyama、Osamu Onomura
DOI:10.1002/chem.201103800
日期:2012.2.27
oxazolines: A synthetic method to prepare optically active oxazolines through a copper‐catalyzed asymmetric desymmetrization of 1,3‐diols has been successfully developed. This reaction system tolerated a diverse range of substrates to give the desired oxazoline derivatives in good to excellent yields with high enantioselectivities (see scheme).
POM alert: The incorporation of an amide oxygen atom into the framework of the Dawson‐type polyoxometalate (POM) cluster [P2V3W15O62]9− (see picture) allows the communication of electronic effects between the organic and the inorganic parts of the molecule, including fine‐tuning of the redox properties of the entire hybrid POM by the organic components, and transmission of the POM's electron‐attracting
POM警报:在Dawson型多金属氧酸盐(POM)簇[P 2 V 3 W 15 O 62 ] 9−的框架中掺入酰胺氧原子,可以在有机物和有机物之间传递电子效应。分子的无机部分,包括通过有机成分对整个杂化POM的氧化还原特性进行微调,以及将POM的电子吸引特性传递至有机部分。
EP2671877
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公开(公告)日:——
Enantioselective Formation oftert-Alkylamines by Desymmetrization of 2-Substituted Serinols
作者:Mi Sook Hong、Tae Woo Kim、Byunghyuck Jung、Sung Ho Kang
DOI:10.1002/chem.200701875
日期:2008.4.7
Novel enantioselectivedesymmetrization of 2-substituted 2-amino-1,3-propanediols has been established to generate asymmetric quaternary carbon centers comprising an amino group. Enantioselective as well as chemical conversion proved to be greatly dependent on the protecting group of the amino group in the substrate, desymmetrizing reagent, base, solvent, and naturally, catalyst. The highly effective
The phosphovanadotungstate polyanion [P2W15V3O62](9-) is a powerful support to stabilize palladacycles conjugated to the inorganic framework via an organic ligand. The insertion can be directed toward sp(2) or sp(3) C-H insertion upon appropriate choice of the substitution pattern on the organic ligand. OFT modeling indicates that the strong withdrawing effect of the POM transmitted through the conjugated carbonyl was responsible for this easy insertion. The palladacycles led to the formation of stilbene via a Mizoroki-Heck reaction. However it is likely that the POMs act as Pd-reservoirs for the formation of nanoparticles. (C) 2013 Elsevier Ltd. All rights reserved.