Idesolide was synthesized in five steps from benzoic acid by base-catalyzed dimerization of hydroxy keto ester, obtained from diol, the product of the whole-cell fermentation of benzoic acid with R. eutrophus B9.
Palladium-catalyzed stereoselective domino arylation–acylation: an entry to chiral tetrahydrofluorenone scaffolds
作者:Petter Dunås、Andrew J. Paterson、Gabriele Kociok-Köhn、Martin Rahm、Simon E. Lewis、Nina Kann
DOI:10.1039/d1cc02160e
日期:——
A palladium-catalyzed domino arylation-cyclization of biocatalytically derived cyclic 1,3-dienes is demonstrated. The reaction introduces a high degree of structural complexity in a single step, giving access to tricyclic tetrahydrofluorenones with full regio- and stereoselectivity. The transformation proceeds through a novel acylation-terminated Heck-type sequence, and quantum chemical calculations
A Formal Approach to Xylosmin and Flacourtosides E and F: Chemoenzymatic Total Synthesis of the Hydroxylated Cyclohexenone Carboxylic Acid Moiety of Xylosmin
cyclohexenone carboxylic acid moiety of xylosmin was synthesized in eight steps from benzoic acid. The key steps in the synthesis involved the enzymatic dihydroxylation of benzoic acid by the whole cell fermentation with Ralstonia eutrophus B9, and Henbest epoxidation. Early attempts led to the synthesis of a C6 epimer of the methyl ester of the hydroxylated cyclohexenone carboxylic acid moiety. The absolute stereochemistry
Palladium Catalyzed Stereoselective Arylation of Biocatalytically Derived Cyclic 1,3-Dienes: Chirality Transfer via a Heck-Type Mechanism
作者:Andrew J. Paterson、Petter Dunås、Martin Rahm、Per-Ola Norrby、Gabriele Kociok-Köhn、Simon E. Lewis、Nina Kann
DOI:10.1021/acs.orglett.0c00708
日期:2020.3.20
Microbial arene oxidation of benzoic acid with Ralstonia eutropha B9 provides a chiral highly functionalized cyclohexadiene, suitable for further structural diversification. Subjecting this scaffold to a Pd-catalyzed Heck reaction effects a regio- and stereoselective arylation of the cyclohexadiene ring, with 1,3-chiralitytransfer of stereogenic information installed in the microbial arene oxidation. Quantum
Synthesis of Carba-β-<scp>l</scp>-Fructopyranose and Carbacyclic Analogs of Topiramate, an Anticonvulsant Agent
作者:Michael H. Parker、Bruce E. Maryanoff、Allen B. Reitz
DOI:10.1055/s-2004-831305
日期:——
We have prepared carba-β-l-fructopyranose (3) starting from (1S,2R)-1,2-dihydroxycyclohexa-3,5-diene-1-carboxylic acid (5). In addition, an unsaturated derivative bearing a double bond in the ring (viz. 4) was prepared. These l-carbacyclic derivatives of fructose were converted to the corresponding analogs of topiramate, a novel anticonvulsant agent currently in clinical practice.