The use of Bronsted acid ionic liquid (BAIL) as a catalyst for the activation of unreactive and unprotected glycosyl donors has been demonstrated for the first time in aqueous solution. (c) 2013 Elsevier Ltd. All rights reserved.
Novel Ruthenium Complexes Having Hybrid Amine Ligands, Their Preparation And Use
申请人:Sandoval Christian A.
公开号:US20110092712A1
公开(公告)日:2011-04-21
The invention relates to a novel class of ruthenium complexes containing phosphine and hybrid amine ligands, their preparation and use as catalysts in the reduction of simple ketones to alcohols by molecular hydrogenation. The reactivity and enantioselectivity of such complexes in the asymmetric hydrogenation of simple ketones could be enchanced by the addition of some selective additives.
Synthesis of tetrazole analogues of amino acids using Fmoc chemistry: isolation of amino free tetrazoles and their incorporation into peptides
作者:Vommina V. Sureshbabu、Rao Venkataramanarao、Shankar A. Naik、G. Chennakrishnareddy
DOI:10.1016/j.tetlet.2007.07.129
日期:2007.9
An efficient synthesis of tetrazole analogues of aminoacids starting from Nα-Fmoc aminoacid in a three-step protocol is reported. The free amino tetrazoles were obtained in good yields and with excellent purity after removal of the Fmoc group. The synthesis of analogues of aspartic and glutamic acids in which the 5-tetrazolyl moiety is inserted at the β/γ carboxyl group starting from Fmoc-Asn and
[EN] NOVEL RUTHENIUM COMPLEXES HAVING HYBRID AMINE LIGANDS, THEIR PREPARATION AND USE<br/>[FR] NOUVEAUX COMPLEXES DE RUTHÉNIUM POSSÉDANT DES LIGANDS AMINES HYBRIDES, LEUR PRÉPARATION ET LEUR UTILISATION
申请人:ENANTIOTECH CORP LTD
公开号:WO2009149670A1
公开(公告)日:2009-12-17
The invention relates to a novel class of ruthenium complexes containing phosphine and hybrid amine ligands, their preparation and use as catalysts in the reduction of simple ketones to alcohols by molecular hydrogenation. The reactivity and enantioselectivity of such complexes in the asymmetric hydrogenation of simple ketones could be enchanced by the addition of some selective additives.
Novel Azapeptide Inhibitors of Hepatitis C Virus Serine Protease
作者:Murray D. Bailey、Ted Halmos、Nathalie Goudreau、Ewen Lescop、Montse Llinàs-Brunet
DOI:10.1021/jm049864b
日期:2004.7.1
studies, we have shown that this series of inhibitors bind in a noncovalent competitive fashion to the NS3 protease active site. The bound conformation of one of these new azapeptide-based inhibitors was determined using the transfer NOE technique. Incorporation of these new aza-amino acyl functionalities in the P1 position provided a handle to probe for new interactions in the S' region of the enzyme
New N-terminal prolyl-dipeptide derivatives as organocatalysts for direct asymmetric aldol reaction
作者:Ji-Fu Zheng、Yao-Xian Li、Suo-Qin Zhang、Song-Tao Yang、Xiao-Ming Wang、Yong-Zhi Wang、Jie Bai、Fu-An Liu
DOI:10.1016/j.tetlet.2006.08.084
日期:2006.10
A series of new N-terminal prolyl-dipeptide derivatives have been synthesized and evaluated as organocatalysts for the direct asymmetric aldol reaction of acetone with electron-deficient aromatic aldehydes. At room temperature, the presence of 10 mol % of catalysts 2 and 5 efficiently catalyzes the direct asymmetric aldol reaction to give the aldol adducts with modest to excellent enantiomeric excesses