An efficient and environmentally benign protocol for the synthesis of vicinal chlorohydroxy and chloromethoxy derivatives in a highly regioselective manner fromolefins using NH4Cl as a chlorine source and oxone as an oxidant in aqueous acetone and methanol is demonstrated. This methodology offers an additive and metal chloride free approach and is endowed with simple reaction conditions, high yields
Trihaloisocyanuric Acid/Triphenylphosphine: An Efficient System for Regioselective Conversion of Epoxides into Vicinal Halohydrins and Vicinal Dihalides under Mild Conditions
作者:Marcio de Mattos、Vitor de Andrade
DOI:10.1055/s-0035-1560408
日期:——
vicinal chloro-/bromohydrins and vicinal dihalides by reaction with the system trihaloisocyanuric acid/triphenylphosphine in acetonitrile under mild and neutral conditions. The reactions proceed smoothly in high yield at room temperature and at reflux, respectively, over a short time. A new synthetic method has been developed for the regioselective conversion of epoxides to vicinal chloro-/bromohydrins
Simultaneous iridium catalysed oxidation and enzymatic reduction employing orthogonal reagents
作者:Francesco G. Mutti、Andreas Orthaber、Joerg H. Schrittwieser、Johannes G. de Vries、Rudolf Pietschnig、Wolfgang Kroutil
DOI:10.1039/c0cc02813d
日期:——
An iridium catalysed oxidation was coupled concurrently to an asymmetric biocatalytic reduction in one-pot; thus it was shown for the first time that iridium- and alcohol dehydrogenase-catalysed redox reactions are compatible. As a model system racemic chlorohydrins were transformed to enantioenriched chlorohydrins via an oxidation-asymmetric reduction sequence.
Ring Opening of Epoxides with Acetone Cyanohydrin Catalyzed by Lanthanoid(III) Alkoxides
作者:Hiroshi Ohno、Atsunori Mori、Shohei Inoue
DOI:10.1246/cl.1993.975
日期:1993.6
Ring opening of epoxide and aziridine with acetonecyanohydrin is promoted by a catalytic amount of lanthanoid(III) alkoxide to provide β-hydroxy nitrile and β-amino nitrile, respectively.
Regio- and Stereoselective Ring Opening of Epoxides and Aziridines Using Zirconyl Chloride: An Efficient Approach for the Synthesis of β-Chlorohydrins and β-Chloroamines
Zirconyl chloride mediated regio- and stereoselective ring opening of epoxides and aziridines at room temperature affords the corresponding β-chlorohydrins and β-chloroamines, respectively in high yields.