The Michael reaction of silyl enol ethers or ketene silyl acetals with conjugated nitro olefins activated by Lewis acids: new synthesis of 1,4-diketones and .gamma.-oxo esters
The Lewis acid-catalyzed reaction of nitro olefins and ketene methyl trimethylsilyl acetals afforded methyl 4-oxo-carboxylates on hydrolysis of the resulting adducts followed by treatment with diazomethane.
A de novo Synthesis of Oxindoles from Cyclohexanone-Derived γ-Keto-Ester Acceptors Using a Desaturative Amination–Cyclization Approach
作者:Henry P. Caldora、Sebastian Govaerts、Daniele Leonori、Shashikant U. Dighe、Oliver J. Turner
DOI:10.1055/a-1538-8429
日期:2021.11
approach for oxindole synthesis. This method uses simple ethyl 2-(2-oxocyclohexyl)acetates and primary amine building blocks as coupling partners. A dual photoredox–cobalt manifold is used to generate a secondary aniline that, upon heating, cyclizes with the pendent ester functionality. The process operates under mild conditions and was applied to the modification of several aminoacids, the blockbuster
Visible‐Light‐Mediated Charge Transfer Enables C−C Bond Formation with Traceless Acceptor Groups
作者:Michael J. James、Felix Strieth‐Kalthoff、Frederik Sandfort、Felix J. R. Klauck、Felicitas Wagener、Frank Glorius
DOI:10.1002/chem.201901397
日期:2019.6.21
enabled by the photoexcitation of electron donor–acceptor (EDA) complexes with visiblelight. The traceless acceptors, which were readily prepared from amino acid and peptide feedstocks, could be used to alkylate a wide range of heteroarene and enamine donors under metal‐ and peroxide‐free conditions. The crucial role of the EDAcomplexes in the mechanism of these reactions was explored through combined
Methods and intermediates for the synthesis of carprofen and its derivatives starting from cyclohexanone are disclosed.
公开了一种从环己酮开始合成卡洛芬及其衍生物的方法和中间体。
Tetrahydrocarbazole 1-alkanoic acids, pharmaceutical compositions and use
申请人:Merck & Co., Inc.
公开号:US04808608A1
公开(公告)日:1989-02-28
Tetrahydrocarbazole 1-alkanoic acids are disclosed. The compounds act as prostaglandin and thromboxane antagonists and are useful in treating asthma, diarrhea, hypertension, angina, platlet aggregation, cerebral spasm, premature labor, spontaneous abortion and dysmenorrhea and as cytoprotective agents.