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
Time-Economical Synthesis of Bis-Spiro Cyclopropanes via Cascade 1,6-Conjugate Addition/Dearomatization Reaction of <i>para</i>
-Quinone Methides with 3-Chlorooxindoles
A simple method involving DBN‐mediated spirocyclopropanation of para‐quinonemethides with 3‐chlorooxindoles is reported, providing a novel class of bis‐spiro compounds in short reaction times under mild conditions. Twenty‐four examples of the target compounds were obtained in up to 96 % yield.
Asymmetric synthesis of 3-spirocyclopropyl-2-oxindoles via intramolecular trapping of chiral aza-ortho-xylylene
作者:Xiaowei Dou、Weijun Yao、Bo Zhou、Yixin Lu
DOI:10.1039/c3cc45369c
日期:——
Chiral aza-ortho-xylylene intermediates were efficiently generated from 3-chloro-3-substituted oxindole precursors. The first intramoleculartrapping of chiral aza-ortho-xylylene intermediates led to a highly asymmetric synthesis of 3-spirocyclopropyl-2-oxindoles.
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