A Ruthenium-Catalyzed, Novel and Facile Procedure for the Conversion of Vicinal Dihaloalkenes to α-Diketones
作者:Faiz Ahmed Khan、B. Prabhudas、Jyotirmayee Dash、Nilam Sahu
DOI:10.1021/ja001956c
日期:2000.10.1
transition metal chemistry, used in the preparation of variety of heterocycles and natural products. α-Diketones also function as the key elements in the Weiss reaction and in the construction of rigid molecular assemblies (molecular wires, rods, etc.) based on ‘block’ chemistry. Some of the common methods to obtain α-diketones are: (i) oxidation of αhydroxyketones, (ii) oxidation of alkynes, and (iii)
Biooxidation of Bridged Cycloketones Using Baeyer−Villiger Monooxygenases of Various Bacterial Origin
作者:Radka Snajdrova、Ingbert Braun、Thorsten Bach、Kurt Mereiter、Marko D. Mihovilovic
DOI:10.1021/jo701704x
日期:2007.12.1
synthesized and utilized as substrates to study biooxidations mediated by Baeyer−Villigermonooxygenases (BVMO) of various bacterial origin. The required enzymes were heterologously produced by recombinant overexpression systems based on Escherichia coli to enable facile recycling of the required nicotinamide cofactors during the whole-cell biotransformations. Ketone precursors of various structural demands
Bridgehead Substitution via Putative Norborn-1-en-3-ones: Application in the Synthesis of Complex Molecules
作者:Faiz Ahmed Khan、Basavaraj M. Budanur、Chava Sudheer
DOI:10.1002/chem.201500131
日期:2015.5.4
base‐mediated formation of a bridgehead double bond in a bicyclo[2.2.1]heptane system (anit‐Bredt molecules) is described. The synthesis of exocyclic norbornyl enones by Wittig reaction of α‐diketones is reported. These enones and their Michael adducts are used as substrates for the generation of transient bridgeheadenones and their trapping with MeOH and H2O. Bridgehead alcohols are easily synthesized
Photochemistry of cis-fused bicyclo[4.n.0]-2,4-dienes. Ground state conformational control
作者:William G. Dauben、Michael S. Kellogg
DOI:10.1021/ja00533a026
日期:1980.6
Highly efficient and recyclable ruthenium-based supported catalysts
作者:F KHAN、N SAHU
DOI:10.1016/j.jcat.2005.02.001
日期:2005.4.25
A highly efficient, recyclable layered double hydroxide (LDH)-supported ruthenium catalyst system (Ru-LDH) was developed for the facile transformation of 1,2-dihaloalkene moieties in tetrahalonorbornyl derivatives to the corresponding alpha-diketones. The efficiency of other supports such as LDH containing ruthenium(III) in a brucite layer (Ru-Mg-Al), commercial MgO (Ru-MgO), and montmorillonite K-10 (Ru-mont) was evaluated. Our results demonstrate that Ru-LDH and Ru-MgO are equally efficient, and the best turnover number (TON) reached was 5389. For NalO(4) as the co-oxidant, MeCN-H2O was the best solvent, whereas 1,2-dichloroethane/MeCN in a ratio of 5:1 gave superior results for NaOCl (household bleach). (c) 2005 Elsevier Inc. All rights reserved.