The asymmetric catalytic synthesis of 3-cyclotryptamine substituted oxindoles through formal [4 + 2] cycloaddition/cyclization cascade is described. A wide range of cyclotryptamine derivatives were obtained in enantioenriched form under mild reaction conditions and were found to have potential anticancer activity. The strategy enables ready assembly of cyclotryptamine subunits at the C3a–C3a′ positions
描述了通过正式的[4 + 2]环加成/环化级联反应3-环色胺取代的羟吲哚的不对称催化合成。在温和的反应条件下,以对映体富集的形式获得了广泛的环色胺衍生物,发现它们具有潜在的抗癌活性。该策略使C 3a – C 3a'位置的环色胺亚基易于组装,并具有两个四级立体异构中心,具有顺式选择性,从而可以合成光学活性的顺式双(六氢吡咯并吲哚)和环色胺生物碱家族的其他化合物。
Preparation of 3-Sulfonylated 3,3-Disubstituted Oxindoles by the Addition of Sulfinate Salts to 3-Halooxindoles
An efficient method for the preparation of 3-sulfonylated 3,3-disubstituted oxindole derivatives has been developed. The protocol involves a base-catalyzed addition of sulfinatesalts to 3-halooxindoles, affording a wide range of 3-sulfonylated 3,3-disubstituted oxindoles in good to excellent yields under mild conditions. A preliminary trial of asymmetric catalytic version was conducted and gave promising
Organocatalyzed Enantioselective Decarboxylative Stereoablation Reaction for the Construction of 3,3′-Disubstituted Oxindoles Using β-Ketoacids and 3-Halooxindoles
unprecedented method for the construction of opticallyactive 3,3′-disubstituted oxindoles via an organocatalyzed decarboxylative stereoablation reaction has been developed. We describe the first asymmetric reaction between β-ketoacids and 3-halooxindoles utilizing an organocatalyst. This method allows for the formation of a variety of 3,3′-disubstituted oxindoles bearing a keto-carbonyl group, which
Construction of 3-amino-2-oxindoles by direct amination of aniline or α-amino-acid derivatives to 3-bromooxindoles
作者:Min Zhao、Nai-Kai Li、Ya-Fei Zhang、Feng-Feng Pan、Xing-Wang Wang
DOI:10.1016/j.tet.2016.01.039
日期:2016.3
The asymmetric amination of anilines to 3-bromooxindoles was developed in the presence of a bis(oxazoline)-Ni(dppp)Cl2 complex, to provide enantiomerically enriched 3-amino-2-oxindoles with quaternary stereocenters in up to 90% yield with 92:8 er. Simultaneously, direct stereoselective amination of α-amino-acid methyl esters to 3-bromooxindoles was also accomplished without any catalysts, which furnished
KOH-mediated stereoselective alkylation of 3-bromooxindoles for the synthesis of 3,3′-disubstituted oxindoles with two contiguous all carbon quaternary centres
作者:Manju Devi、Amol P. Jadhav、Ravi P. Singh
DOI:10.1039/d0nj06283a
日期:——
The stereoselectivesynthesis of 3,3′-disubstituted oxindoles having all-carbon quaternary stereocenters has been achieved using KOH as a base with an excellent diastereomeric ratio (98 : 2). The practicability of the present methodology has been validated with the synthesis of a series of substrates in good to excellent yields. The aesthetic simplicity, accessibility, and eco-friendly base (KOH) have