Cinchona-alkaloid-catalyzed enantioselective hydroxymethylation of 3-fluorooxindoles with paraformaldehyde
作者:Jian-bo Zhao、Xinfeng Ren、Bu-quan Zheng、Jian Ji、Zi-bin Qiu、Ya Li
DOI:10.1016/j.jfluchem.2018.09.004
日期:2018.11
Cinchona-alkaloid-catalyzed hydroxymethylation of 3-fluorooxindoles using paraformaldehyde as the C1 unit was achieved. A wide range of 3-fluorooxindoles was successfully reacted to give the corresponding 3-fluoro-3-hydroxymethyloxindoles with high efficiency and moderate to good enantioselectivity.
Microwave-Assisted Sequential Amide Bond Formation and Intramolecular Amidation: A Rapid Entry to Functionalized Oxindoles
作者:Rajamohan R. Poondra、Nicholas J. Turner
DOI:10.1021/ol0473804
日期:2005.3.1
two-step process involves initial microwave-assisted amidebondformation between 2-halo-arylacetic acids and various alkylamines and anilines, followed by a palladium-catalyzed intramolecular amidation under aqueous conditions. In the case of alkylamines, the procedure can be carried out as a one-pot process without isolation of the intermediate amide. [structure: see text]
pyrazoloquinazolinone derivatives. The strategy involves a one-pot reaction wherein the N-tosylhydrazone and its corresponding diazo derivative are generated in situ, followed by an intramolecular 1,3-dipolar cycloaddition–ring expansion to provide the pyrazolo-[1,5-c]quinazolinone motif. This approach enables straightforward access to a diverse range of highlyfunctionalized N-heterocyclic compounds
我们开发了一种无过渡金属的方法来构建吡唑并喹唑啉酮衍生物。该策略涉及一锅反应,其中原位生成N-甲苯磺酰腙及其相应的重氮衍生物,然后进行分子内 1,3-偶极环加成环扩展以提供吡唑并-[1,5- c ]喹唑啉酮基序。这种方法能够以良好的产率(高达 92%)直接获得各种高度功能化的 N-杂环化合物。
N-Heterocyclic Carbene-Catalyzed Three-Component Domino Reaction of Alkynyl Aldehydes with Oxindoles
作者:Ding Du、Zhongyuan Hu、Jianlin Jin、Yingyan Lu、Weifang Tang、Bo Wang、Tao Lu
DOI:10.1021/ol300148f
日期:2012.3.2
A new and stereoselective synthetic approach to spirooxindole 4H-pran-2-one derivatives with three contiguous stereogenic centers has been developed via an NHC-catalyzed three-component domino reaction of alkynyl aldehydes with oxindoles. The reaction proceeds smoothly in good yields with good to high diastereoselectivities. These novel heterocyclic spirooxindoles may provide promising candidates for drug discovery. Additionally, a possible mechanism for the entire reaction sequence is proposed.
Palladium-Catalyzed α-Arylation of Oxindoles
作者:Matthew J. Durbin、Michael C. Willis
DOI:10.1021/ol800141t
日期:2008.4.1
A catalyst generated from Pd(dba)(2) and the bulky electron-rich phosphine ligand 2-(dicyclohexylphosphino)-2',4', 6'-tri-i-propyl-1 - 1'-biphenyl is effective for the alpha-arylation of oxindoles. Generation of the potassium-enolates of a range of oxindoles allows coupling with aryl chlorides, bromides, and triflates. Significant variation of the substitution pattern on both the oxindole and aryl halide is possible.