Base-promoted ring opening of 3-chlorooxindoles for the construction of 2-aminoarylthioates and their transformation to quinazolin-4(3<i>H</i>)-ones
作者:Tej Narayan Poudel、Hari Datta Khanal、Yong Rok Lee
DOI:10.1039/c8nj00195b
日期:——
Cesium carbonate-promoted synthesis of diverse 2-aminoarylthioatesviaring opening of 3-chlorooxindoles with thiols, and their synthetic applications is demonstrated.
A diastereodivergentasymmetric Michael-alkylation reaction between 3-chloro-oxindoles and β,γ-unsaturated-α-ketoesters has been achieved using L-RaPr2/Sc(OTf)3 and L-PrPr2/Mg(OTf)2 metal complexes as catalysts. Both rel-(1R,2S,3R) and rel-(1S,2S,3R) chiral spiro cyclopropane oxindoles were constructed in good yields, diastereoselectivities and ee values. The diastereodivergent control may originate
Organocatalytic Asymmetric Synthesis of Spiro-Tetrahydrothiophene Oxindoles Bearing Four Contiguous Stereocenters by One-Pot Michael-Henry-Cascade-Rearrangement Reactions
Asymmetric construction of tetrahydrothiophenes with four contiguous stereocenters remains a formidable challenge. Herein, the bottleneck was addressed by an unprecedented one‐pot Michael–Henry‐cascade–rearrangement reaction that could simultaneously create four consecutive stereogenic centers including two tetrasubstitutedcarbon stereocenters. The highly functionalized chiral spirotetrahydrothiophene
A novel methodology for the efficient synthesis of 3-monohalooxindoles by acidolysis of 3-phosphate-substituted oxindoles with haloid acids
作者:Li Liu、Yue Li、Tiao Huang、Dulin Kong、Mingshu Wu
DOI:10.3762/bjoc.17.150
日期:——
A novel method for the synthesis of 3-monohalooxindoles by acidolysis of isatin-derived 3-phosphate-substituted oxindoles with haloid acids was developed. This synthetic strategy involved the preparation of 3-phosphate-substituted oxindole intermediates and SN1 reactions with haloid acids. This new procedure features mild reaction conditions, simple operation, good yield, readily available and inexpensive
开发了一种通过用卤代酸酸解靛红衍生的 3-磷酸取代 oxindoles 来合成 3-monohalooxindoles 的新方法。该合成策略涉及制备 3-磷酸取代的羟吲哚中间体以及与卤酸的S N 1 反应。该新工艺具有反应条件温和、操作简单、收率好、原料易得且价格低廉、克级规模化等特点。
Catalytic Asymmetric [4 + 1] Cyclization of Benzofuran-Derived Azadienes with 3-Chlorooxindoles
作者:Cong-Shuai Wang、Tian-Zhen Li、Yu-Chun Cheng、Ji Zhou、Guang-Jian Mei、Feng Shi
DOI:10.1021/acs.joc.8b03004
日期:2019.3.15
[4 + 1] cyclization of benzofuran-derived azadienes with 3-chlorooxindoles has been established, which constructed chiral spirooxindole frameworks with in situ generation of a five-membered ring with high diastereoselectivities (up to >95:5 dr) and good enantioselectivities (up to 94:6 er). This reaction represents the first catalytic asymmetric [4 + 1] cyclization of benzofuran-derived azadienes, which