An organocatalyticenantioselective Michael–Michael cascadereaction is developed for the synthesis of chiral spirotetrahydrothiopyrans. This highly functionalized scaffold was assembled in moderate to good yield (55–74%) and excellent diastereo- and enantioselectivities (>30:1 dr, ≥ 99% ee) with the creation of fourconsecutive stereogenic centers. The novel spiro-oxindole scaffold is validated as
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。
Construction of Spirocyclopropane-Linked Heterocycles Containing Both Pyrazolones and Oxindoles through Michael/Alkylation Cascade Reactions
作者:Jun-Hua Li、Ting-Fan Feng、Da-Ming Du
DOI:10.1021/acs.joc.5b01940
日期:2015.11.20
diastereoselective Michael/alkylation cascade reaction of arylidenepyrazolones with 3-chlorooxindoles catalyzed by DIPEA was developed. A variety of highly functionalized spiro-pyrazolone-cyclopropane-oxindoles were obtained in excellent yields (up to 99%) with good to excellent diastereoselectivities (up to >25:1 dr). Moreover, the squaramide-catalyzed asymmetric reactions of arylidenepyrazolones with
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
Catalytic Asymmetric [4+1] Cyclization of <i>ortho</i>
-Quinone Methides with 3-Chlorooxindoles
作者:Xiao-Li Jiang、Si-Jia Liu、Yu-Qi Gu、Guang-Jian Mei、Feng Shi
DOI:10.1002/adsc.201700487
日期:2017.10.4
In this work, we established catalyticasymmetric [4+1] cyclization of ortho‐quinone methides (o‐QMs) with 3‐chlorooxindoles and a catalyticasymmetric domino oxidation/[4+1] cyclization reaction of 2‐alkylphenols with 3‐chlorooxindoles, which constructed a spirooxindole‐based 2,3‐dihydrobenzofuran scaffold in good yield (up to 97%), with excellent diastereoselectivity (up to >95:5 dr) and high enantioselectivity