Enzymatic kinetic resolution of aliphatic sec -alcohols by LipG9, a metagenomic lipase
摘要:
Bioprospection for new enantioselective enzymes for application in organic synthesis is a prominent area of investigation in biocatalysis. In this context, here we present the evaluation of an immobilized lipase isolated from a metagenomic library (LipG9) for the enzymatic kinetic resolution (EKR) of aliphatic sec -alcohols, which are still challenging substrates, since low enantioselectivity values are usually observed for these resolutions. LipG9 was successfully employed in EKR of aliphatic alcohols, which were resolved with satisfactory conversions (19-59%) and enantiomeric excesses for alcohols (26-88%) and esters (30-96%) by transesterification reactions, demonstrating that its performance is equal to or better than commercially available enzymes for the same reaction. (C) 2016 Elsevier B.V. All rights reserved.
Polymer-supported gadolinium triflate as a convenient and efficient Lewis acid catalyst for acetylation of alcohols and phenols
作者:Hyo-Jin Yoon、Sang-Myung Lee、Jong-Ho Kim、Hong-Jun Cho、Jung-Woo Choi、Sang-Hyeup Lee、Yoon-Sik Lee
DOI:10.1016/j.tetlet.2008.03.005
日期:2008.5
(CMPS-IM-Gd) catalyst was prepared from chloromethyl polystyrene (CMPS) resin using a simple and convenient procedure. This polymeric catalyst was used as an efficient Lewisacidcatalyst for the acetylation of various alcohols and phenols with acetic anhydride, affording high yields under mild conditions. The reaction was completed in a short period of time with small amounts of the catalyst. The catalyst
[EN] BENZAMIDE IMIDAZOPYRAZINE BTK INHIBITORS<br/>[FR] COMPOSÉS BENZAMIDES ET IMIDAZOPYRAZINES UTILISÉS COMME INHIBITEURS DE LA BTK
申请人:MERCK SHARP & DOHME
公开号:WO2016106623A1
公开(公告)日:2016-07-07
Provided are Bruton's Tyrosine Kinase (Btk) inhibitor compounds according to Formula I, pharmaceutically acceptable salts thereof, pharmaceutical compositions thereof, or their use in therapy.
<i>N,N′</i>-Dibromo-<i>N,N′</i>–1,2-ethanediylbis(benzene sulfonamide) as an Efficient Catalyst for Acetylation and Formylation of Alcohols Under Mild Conditions
An efficient method for the acylation and formylation of alcohols and phenols by using an acylating/formylating agent (acetic anhydride and formic acid) in the presence of a catalytic amount of N,N′-dibromo-N,N′–1,2-ethanediylbis(benzene sulfonamide) under mild and solvent-freeconditions at room temperature in good to excellent yields is described. The use of protic acids and metal Lewis acids is
Cobalt carbonyl catalyzed reactions of esters and lactones with hydrosilane and carbon monoxide. A novel synthetic method for the introduction of the siloxymethylidene group
monoxide took place except for bridgehead alkyl acetates. The mechanism of the catalytic reaction has been proposed, and the importance of the silycobalt carbonyl, R/sub 3/SiCO(CO)/sub 4/, as the key catalyst species has been suggested. The high affinity of the silicon in R/sub 3/SiCo(CO)/sub 4/ toward the oxygenatom in the ester is suggested to be the driving force for the formation of alkylcobalt carbonyls
Fractional distribution of graphene oxide and its potential as an efficient and reusable solid catalyst for esterification reactions
作者:Harshal P. Mungse、Niharika Bhakuni、Deependra Tripathi、Om P. Sharma、Bir Sain、Om P. Khatri
DOI:10.1002/poc.3375
日期:2014.12
be a highly efficient and reusablesolidcatalyst for the esterification of various carboxylic acids with a variety of alcohols to furnish corresponding esters in high to excellent yields. The catalytic activity of the GrO5000 was attributed to the ability of highly polar GrO5000 scaffold to adsorb/attract reactants, where the acid functionalities of GrO5000 facilitated the esterification process efficiently