Neutral Nazarov-Type Cyclization Catalyzed by Palladium(0)
作者:Naoyuki Shimada、Craig Stewart、William F. Bow、Anais Jolit、Kahoano Wong、Zhe Zhou、Marcus A. Tius
DOI:10.1002/anie.201201724
日期:2012.6.4
Joining the circle: The first Pd0 catalyzed Nazarov‐type cyclization of diketoesters (see scheme) proceeds in 70 % to 95 % yield under strictly neutral pH conditions. Aryl substitution of the diketoesters is not required, so the reaction shows great versatility and can also proceed with aliphatic substrates.
SYNTHESIS AND APPLICATION OF CHIRAL SUBSTITUTED POLYVINYLPYRROLIDINONES
申请人:Kansas State University Research Foundation
公开号:US20200306737A1
公开(公告)日:2020-10-01
Chiral polyvinylpyrrolidinone (CSPVP), complexes of CSPVP with a core species, such as a metallic nanocluster catalyst, and enantioselective oxidation reactions utilizing such complexes are disclosed. The CSPVP complexes can be used in asymmetric oxidation of diols, enantioselective oxidation of alkenes, and carbon-carbon bond forming reactions, for example. The CSPVP can also be complexed with biomolecules such as proteins, DNA, and RNA, and used as nanocarriers for siRNA or dsRNA delivery.
Reductive deoxygenation using hydridozirconium enolates: A new synthesis of α,β-unsaturated esters
作者:Alexander G. Godfrey、Bruce Ganem
DOI:10.1016/s0040-4039(00)60795-5
日期:——
An unusual new reaction of Cp2ZrHCl transforms β-ketoesters into α,β-unsaturatedesters in one step and provides a useful alternative to the traditional, three-step process of reduction, mesylation/tosylation, and elimination.
New thiophosphates containing functionalized cyclic ketone derivatives as ligands have been stereoselectively prepared from readily available starting materials. Full axial stereoselectivity of the NaBH4 reduction of the carbonyl group in thiophosphates providing the corresponding thiols or sulfides has been demonstrated. The sulfides have been transformed into new functionalized cyclic Baylis–Hillman type adducts of defined configuration. The prospects for the useful synthetic application of these adducts appear to be very promising.
Conjugate addition of organocopper reagents to unsaturated esters
作者:Hiroshi Sakata、Isao Kuwajima
DOI:10.1016/s0040-4039(00)96823-0
日期:——
A combination of copper (I) trimethylsilylacetylide and chlorotrimethylsilane accelerates the conjugate addition of an alkyllithium to α, β-unsaturated esters to give the 1, 4-addition products in good yields.