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.
Synthesis, characterization, and catalytic activity of beidellite–montmorillonite layered sillcates and their pillared analogues
作者:Paul A. Diddams、John M. Thomas、William Jones、James A. Ballantine、J. Howard Purnell
DOI:10.1039/c39840001340
日期:——
characterized by a range of techniques, including high-resolution 27Al ans 29Si solid-state n.m.r. spectroscopy, shows interesting catalyticactivity (in secondary amine formation from cyclohexylamine, in ester production from hex-1-ene and acetic acid, and in ether synthesis from pentanol): the selectivities differ significantly from those of montmorillonite-smectites.
PRODRUGS OF NH-ACIDIC COMPOUNDS: ESTER, CARBONATE, CARBAMATE AND PHOSPHONATE DERIVATIVES
申请人:Blumberg Laura Cook
公开号:US20110319422A1
公开(公告)日:2011-12-29
The invention provides a method of sustained delivery of a lactam, imide, amide, sulfonamide, carbamate or urea containing parent drug by administering to a patient an effective amount of a prodrug compound of the invention wherein upon administration to the patient, release of the parent drug from the prodrug is sustained release. Prodrug compounds suitable for use in the methods of the invention are labile conjugates of parent drugs that are derivatized through carbonyl linked prodrug moieties. The prodrug compounds of the invention can be used to treat any condition for which the lactam, imide, amide, sulfonamide, carbamate or urea containing parent drug is useful as a treatment.
Primary, secondary, and tertiary alcohols supported on solidadsorbents such as alumina, silica gel, celite, magnesium oxide, zinc oxide, titanium oxide, and charcoal were acetylated by ketene in good yields.
Efficient liquid phase acylation of alcohols over basic ETS-10 molecular sieves
作者:Suresh B Waghmode、Vinay V Thakur、Arumugam Sudalai、Subramanian Sivasanker
DOI:10.1016/s0040-4039(01)00389-6
日期:2001.4
Acylation of alcohols with acetic acid can be carried out efficiently in the liquid phase overmicroporoustitanosilicate ETS-10-type catalysts. The reaction was studied overETS-10 exchanged with, Li, Na, K, Rb, Cs, Ba and H ions. Activity for acylation of primary alcohols depends on the exchanged alkali ion and increases in the order Li
Vanadyl Sulfate (VOSO<sub>4</sub>.3H<sub>2</sub>O). An Efficient Catalyst for Acylation of Alcohols and Phenols under Solvent Free Condition
作者:Hossein A. Oskooie、Bita Baghernezhad、Majid M. Heravi、Y. Sh. Beheshtiha
DOI:10.1002/jccs.200800107
日期:2008.8
Alcohols and phenols were efficiently acylated with acetic anhydride in the presence of vanadylsulfate (VOSO 4 .3H 2 O) at room temperature in high yields.