Enzymatic hydrolyses of acetoxy- and phenethylbenzoates by Candida cylindracea lipase
作者:Antonio Cipiciani、Francesco Fringuelli、Anna Maria Scappini
DOI:10.1016/0040-4020(96)00519-4
日期:1996.7
The lipase from Candidacylindracea (CCL) deacetyles rapidly and selectively all three regioisomer methyl acetoxybenzoates. In the enzymatichydrolyses of analogous aryl acetoxybenzoates, the difference of reactivity between the acetoxy and benzoyloxy functionalities is reduced and a methoxy group in meta position of the aryl group reverses the reactivity order making the compounds aspirin or aspirin-like
Identification of an Esterase Isolated Using Metagenomic Technology which Displays an Unusual Substrate Scope and its Characterisation as an Enantioselective Biocatalyst
作者:Declan P. Gavin、Edel J. Murphy、Aoife M. Foley、Ignacio Abreu Castilla、F. Jerry Reen、David F. Woods、Stuart G. Collins、Fergal O'Gara、Anita R. Maguire
DOI:10.1002/adsc.201801691
日期:2019.6.6
Evaluation of an esterase annotated as 26D isolated from a marine metagenomic library is described. Esterase 26D was found to have a unique substratescope, including synthetic transformations which could not be readily effected in a synthetically useful manner using commercially available enzymes. Esterase 26D was more selective towards substrateswhich had larger, more sterically demanding substituents
Metal-Free Oxidative Cross Esterification of Alcohols<i>via</i>Acyl Chloride Formation
作者:Silvia Gaspa、Andrea Porcheddu、Lidia De Luca
DOI:10.1002/adsc.201500912
日期:2016.1.7
achieved using trichloroisocyanuric acid as an oxidant. The alcohols were converted in situ into their corresponding acyl chlorides, which were then reacted with primary and secondary aliphatic, benzylic and allylic alcohols and phenols. A wide variety of esters was obtained in satisfactory yields.
Polystyrene-supported GaCl3: A new, highly efficient and recyclable heterogeneous Lewis acid catalyst for acetylation and benzoylation of alcohols and phenols
作者:Ali Rahmatpour
DOI:10.1016/j.crci.2012.08.005
日期:2012.11
Résumé A new, simple and highly chemoselective method for both acetylation and benzoylation of alcohols and phenols with acetic anhydride in the presence of polystyrene-supported gallium trichloride (PS/GaCl3) as a highly active and reusable heterogeneous Lewis acid catalyst is presented. In this catalytic system, primary, secondary and tertiary alcohols as well as phenols were converted to the corresponding acetates and benzoates with high yields. The heterogenized catalyst is of high reusability and stability in the acetylation reactions and was recovered several times with negligible loss in its activity or a negligible catalyst leaching, and also there is no need for regeneration. Remarkably, a selective mono-acetylation of symmetrical diols can be achieved chemoselectively by employing the same catalyst.
The synergy between a nature-inspired ionic solvent and Mo(CO)6, as a solid source of carbon monoxide, allowed to develop a Pd-catalyzed amino- and alkoxycarbonylation under mild reaction conditions and with an improved degree of sustainability.