Asymmetric Stereoablative Aryloxylation of 3-Bromooxindoles with Bifunctional Catalyst
作者:Amol P. Jadhav、Aarti Manchanda、Manish K. Jaiswal、Ravi P. Singh
DOI:10.1002/adsc.201700693
日期:2017.11.23
In this communication, the development of a highly enantioselective stereoablative protocol for the chemoselective aryloxylation of 3-bromooxindoles with aryl alcohols have been realized. Promoted by easily available cinchona alkaloid derivatives (C6′−OH) under air- and moisture-tolerant conditions, aryloxylation of a wide range of 3-bromooxindoles bearing a 3′-alkyl substituent proceeded in high yields
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。
Evolution of a Unified, Stereodivergent Approach to the Synthesis of Communesin F and Perophoramidine
作者:Seo-Jung Han、Florian Vogt、Jeremy A. May、Shyam Krishnan、Michele Gatti、Scott C. Virgil、Brian M. Stoltz
DOI:10.1021/jo502534g
日期:2015.1.2
Expedient synthetic approaches to the highly functionalized polycyclic alkaloids communesin F and perophoramidine are described using a unified approach featuring a key decarboxylative allylic alkylation to access a crucial and highly congested 3,3-disubstituted oxindole. Described are two distinct, stereoselective alkylations that produce structures in divergent diastereomeric series possessing the
Construction of the N1–C3 Linkage Stereogenic Centers by Catalytic Asymmetric Amination Reaction of 3-Bromooxindoles with Indolines
作者:Hailong Zhang、Hong Kang、Liang Hong、Weiping Dong、Guolin Li、Xin Zheng、Rui Wang
DOI:10.1021/ol5007423
日期:2014.5.2
The catalytic asymmetric amination reaction of 3-bromooxindoles with indolines for the construction of the N1–C3 linkage stereogenic centers has been realized for the first time. Moreover, the racemic substrates (3-substituted indolines) were also applicable under the same chiral conditions. The newly developed method conveniently led to a formal synthesis of (+)-psychotrimine.