possessing a NH functionality at C-1 position as monodentate hydrogen bond donor were developed and evaluated for enantioselective organocatalytic alcoholysis of meso-cyclic anhydrides. These structural diversified organocatalysts were found to induce high enantioselectivity in alcoholysis of anhydrides and was successfully applied to the asymmetric synthesis of (S)-GABOB.
The immobilisation of chiral organocatalysts on magnetic nanoparticles: the support particle cannot always be considered inert
作者:Oliver Gleeson、Gemma-Louise Davies、Aldo Peschiulli、Renata Tekoriute、Yurii K. Gun'ko、Stephen J. Connon
DOI:10.1039/c1ob06110k
日期:——
catalysis by the nanoparticles in the absence of the organocatalyst was detected, which explains in part the poor performance of the immobilised organocatalysts in these reactions from a stereoselectivity standpoint. It seems clear that the immobilisation of sensitive chiral organocatalysts onto magnetite nanoparticles does not always result in heterogeneous catalysts with acceptable activity and selectivity
Organocatalytic desymmetrization of cyclic meso-anhydrides through enantioselective alcoholysis with functionalized primary nitroallylic alcohols
作者:Yan ming Chen、Mamatha Amireddy、Kwunmin Chen
DOI:10.1016/j.tet.2014.10.008
日期:2014.11
The direct organocatalytic desymmetrization of cyclic meso-anhydrides was achieved by alcoholysis with nitroallylic alcohols. The reaction between primary nitroallylic alcohols and cyclic meso-anhydrides catalyzed by cinchonidine derived thiourea organocatalyst II (10 mol %) proceeded smoothly. The corresponding hemiesters were obtained in high chemical yields with high to excellent levels of stereoselectivity
A highly stereoselective and recyclable microgel-supported bifunctional sulfonamide organocatalyst for asymmetric alcoholysis of <i>meso</i>-cyclic anhydrides: a thermo-responsive “organic nanoreactor”
作者:Fei Xiong、Chao Ma、Yi-Ren Zhu、Chen Sun、Lu Chen、Yan-Jun Zhang、Yuan-Jie Zhu、Zhong-Hua Wang
DOI:10.1039/d2nj01914k
日期:——
immobilization on a highly cross-linked three-dimensional network structure through covalent interactions. The microgel-supported organocatalyst has been successfully applied to catalyze the asymmetricalcoholysis reaction in high yields and good stereoselectivity (up to 90% ee). Furthermore, the polymeric catalysts could be recovered easily and reused multiple times (5 runs) without apparent loss of