A Highly Efficient Ruthenium-Catalyzed Rearrangement of α,β-Epoxyketones to 1,2-Diketones
作者:Chia-Lung Chang、Manyam Praveen Kumar、Rai-Shung Liu
DOI:10.1021/jo0303867
日期:2004.4.1
TpRuPPh3(CH3CN)2PF6 catalyzed the efficient rearrangement of α,β-epoxyketones to 1,2-diketones. Unlike a previously reported iron catalyst, the reaction in this case is applicable not only to 1,2-disubstituted epoxides but also to mono- and trisubstituted epoxides and tolerates oxygen functionalities. The sterically crowded and highly basic tris(1-pyrazolyl)borate (Tp) ligand of the ruthenium catalyst
Electrochemical hydroxyselenenylation as a new method for one-step preparation of α-arylseleno-α,β-unsaturated aldehydes from 3-hydroxyalkynes
作者:Kenji Uneyama、Kunikaju Takano、Sigeru Torii
DOI:10.1016/s0040-4039(00)87049-5
日期:1982.1
Electrochemical oxidation of 3-hydroxyalkynes in the presence of diaryl diselenides in MeCNH2O provided α-arylseleno-α,β-unsaturated aldehydes in 62 – 94% yields hydroxyselenenylation of alkynes.
A New Zincate-Mediated Rearrangement Reaction of 2-(1-Hydroxyalkyl)-1-alkylcyclopropanol
作者:Kenichi Nomura、Seijiro Matsubara
DOI:10.1002/chem.200901054
日期:2010.1.11
A novel rearrangement of 2‐(1‐hydroxyalkyl)‐1‐alkylcyclopropanol has been found. It proceeds in the presence of a catalytic amount of organozinc ate complex to give vic‐diols. The rearrangement can be applied to various types of 2‐(1‐hydroxyalkyl)‐1‐alkylcyclopropanol, which can be easily prepared from the corresponding α,β‐epoxyketones and bis(iodozincio)methane. When bicyclo[13.1.0]pentadecane‐1
Preparation of proximal β-hydroxy silyl enol ethers from α,β-epoxyketones using silyllithium reagents
作者:Heather K. Baker、Aaron M. Hartel
DOI:10.1016/j.tetlet.2009.04.085
日期:2009.7
stereoselective preparation of proximal β-hydroxy silyl enol ethers from α,β-epoxyketones using silyllithium reagents has been developed. The reaction is believed to proceed via Brook rearrangement assisted by opening of the adjacent epoxide. A number of α,β-epoxyketones were reacted with methyldiphenylsilyllithium to form the corresponding proximal β-hydroxy silyl enol ethers in good to excellent yield and excellent
Zincate-mediated rearrangement reaction of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol
作者:Kenichi Nomura、Seijiro Matsubara
DOI:10.1039/b901043b
日期:——
A rearrangement of lithium alkoxide of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol into lithium alkoxide of vic-diol was mediated with an organozincate complex.