Enantioselective Copper(I/II)-Catalyzed Conjugate Addition of Nitro Esters to β,γ-Unsaturated α-Ketoesters
作者:Sheng Zhang、Kun Xu、Fengfeng Guo、Yanbin Hu、Zhenggen Zha、Zhiyong Wang
DOI:10.1002/chem.201303512
日期:2014.1.20
A highly enantioselective Michael addition of nitroacetates to β,γ‐unsaturatedα‐ketoesters was developed by using chiral copper catalysts. The Michael addition products can be obtained in high yields with up to 99 % ee. With these densely functionalized products, the chiral cyclic nitrones, which are important synthetic intermediates, can be obtained in one step.
Palladium-Catalyzed Stereospecific Allylation of Nitroacetates with Enantioenriched Primary Allylic Amines
作者:Jing-Kun Xu、Yong Wang、Yonghong Gu、Shi-Kai Tian
DOI:10.1002/adsc.201600059
日期:2016.6.2
decarboxylation to afford structurally diverse homoallylic nitro compounds in good to excellent yields with excellent retention of configuration. On the other hand, the allylation followed by denitronation provided a facile synthetic route to opticallyactiveβ‐chiral γ,δ‐unsaturated esters.
Water-reducible coating composition based on an epoxy resin
申请人:AKZO N.V.
公开号:EP0171102A1
公开(公告)日:1986-02-12
The invention provides a water-reducible coating composition comprising an epoxy resin, an amino group-containing curing agent for the epoxy resin and a watersoluble organic compound which occurs in at least 2 tautomeric forms, in one of which a labile hydrogen atom is linked to a carbon atom and which compound contains at least one carbonyloxy group or sulphonyl group.
An aqueous coating composition and a process of coating a substrate with such coating composition
申请人:AKZO N.V.
公开号:EP0262720A1
公开(公告)日:1988-04-06
The invention provides an aqueous coating composition curable at ambient temperature comprising a compound having at least 2α,β-ethylenically unsaturated carboxylate groups, a polyamino amide having an amine number of 60-1000, and a nitroalkane, a formic acid ester or an organic compound occurring in at least 2 tautomeric forms, and in one of the tautomeric forms a labile hydrogen atom is linked to a carbon atom. A process of coating a substrate with such composition is also provided.