Chlorinated iminium chlorides have been identified to promote the highly efficient and selective mono-chlorination of unsymmetrical vicinal diols. Vilsmeier reagent, namely, (chloromethylene)dimethyliminium chloride, enables highly reactive and regioselective chlorination of 1,2- and 1,3-diols featured one secondary benzylic hydroxy group and one primary aliphatic hydroxy group to give the corresponding
Artificial enzymes are required to catalyse non-natural reactions. Here, a hybrid catalyst was developed by embedding a novel Ru complex in the transport protein NikA. The protein scaffold activates the...
Selective manganese-mediated transformations using the combination:
作者:István E Markó、Paul R. Richardson、Mark Bailey、Anita R. Maguire、Niall Coughlan
DOI:10.1016/s0040-4039(97)00309-2
日期:1997.3
A novel manganese reagent, generated from KMnO4 and Me3SiCl, in the presence of a quaternaryammonium salt, is shown to smoothly dichlorinate alkenes, open epoxides and chemoselectively oxidise sulfides to sulfoxides.
1,2-Ferrocenediylazaphosphinines2: A New Class of Nucleophilic Catalysts for Ring-Opening of Epoxides
作者:Tae-Jeong Kim、Seung Hwan Paek、Sang Chul Shim、Chan Sik Cho
DOI:10.1055/s-2003-38758
日期:——
1,2-Ferrocenediylazaphosphinines (1a-c) have been successfully employed as a new class of nucleophilic catalysts for ring-opening of a range of epoxides, their catalytic efficiency in terms of regioselectivity as well as chemical yield comparing well with the existing catalysts in the literature. In contrast, low enantiomeric excesses have been obtained from the reactions of meso-epoxides catalyzed by (R)-1.
Processes for preparing optically active alcohols and optically active amines
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0736509A2
公开(公告)日:1996-10-09
A process for preparing an optically active alcohol by reacting a prochiral ketone corresponding to the optically active alcohol and an acid with a mixture of (1) a boron-containing compound selected from the group consisting of i) a borane compound which is obtained from an optically active β-aminoalcohol and a boron hydride; or obtained from the optically active β-aminoalcohol, a metal borohydride and an acid and ii) an optically active oxazaborolidine and (2) a metal borohydride; and a process for preparing an optically active amine by reacting an oxime derivative and an acid with a mixture of (1) a boron-containing compound selected from the group consisting of i) a borane compound which is obtained from an optically active β-aminoalcohol and a boron hydride, or obtained from said optically active β-aminoalcohol, a metal borohydride and an acid and ii) an optically active oxazaborolidine, and (2) a metal borohydride.