3-Bromooxindoles as nucleophiles in asymmetric organocatalytic Mannich reactions with N-Ts-imines
作者:Jianhao Li、Taiping Du、Gang Zhang、Yungui Peng
DOI:10.1039/c2cc38475b
日期:——
A direct asymmetric Mannich reaction of N-unprotected 3-bromooxindoles with N-Ts-imines catalyzed by bifunctional thiourea derivedfrom 2-substituted cinchona alkaloid was developed. Products with vicinal chiral tertiary and brominated quaternary stereogenic centers were achieved in excellent diastereo- and enantioselectivity (up to 99 : 1 dr, 99% ee).
DABCO-Catalyzed Michael/Alkylation Cascade Reactions Involving α-Substituted Ammonium Ylides for the Construction of Spirocyclopropyl Oxindoles: Access to the Powerful Chemical Leads against HIV-1
作者:Lin Chen、Jin He
DOI:10.1021/acs.joc.9b03164
日期:2020.4.17
tactic has been highlighted by a gram-scale reaction and Suzuki cross-coupling reactions of the product. Moreover, the reaction mechanism has been tentatively elucidated by control experiments and dynamic high-resolution mass spectrometry studies, which indicates that the Michael/alkylation cascade reaction involves DABCO-derived α-substituted ammoniumylides.
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。
Decarboxylative Bromooxidation of Indoles by a Vanadium Haloperoxidase
作者:Clare E. Wells、Lauren P.T. Ramos、Lauren J. Harstad、Logan Z. Hessefort、Hyung Ji Lee、Manik Sharma、Kyle F. Biegasiewicz
DOI:10.1021/acscatal.2c05531
日期:——
bromooxidation of 3-carboxyindoles to furnish 3-bromooxindoles with excellent regio- and chemoselectivity. In addition to the development of the synthetic method, this study provides evidence of a bromide recycling mechanism for the indole oxidation event. A discussion of the reaction development, substrate scope, mechanistic insights, and reaction applicability will be discussed herein.
卤代吲哚是用于构建具有生物学重要性的复杂含羟吲哚靶标的多用途构建块。尽管它们具有合成价值,但从易于获得的起始材料制备 3-halooxindoles 的催化方法仍未公开。我们最近发现,来自Curvularia inaequalis ( Ci VCPO) 的氯过氧化物酶是一种可行的催化剂,可用于 3-羧基吲哚的脱羧溴氧化,以提供具有出色区域选择性和化学选择性的 3-溴氧吲哚。除了合成方法的发展之外,本研究还提供了吲哚氧化事件的溴化物回收机制的证据。本文将讨论反应发展、底物范围、机理见解和反应适用性。
Synthesis of (<i>Z</i>)-3-[amino(phenyl)methylidene]-1,3-dihydro-2<i>H</i>-indol-2-ones using an Eschenmoser coupling reaction
modular method for the synthesis of (Z)-3-[amino(phenyl/methyl)methylidene]-1,3-dihydro-2H-indol-2-ones starting from easily available 3-bromooxindoles or (2-oxoindolin-3-yl)triflate and thioacetamides or thiobenzamides is described. A series of 49 compounds, several of which have previously been shown to possess significant tyrosin kinase inhibiting activity, was prepared in yields varying mostly from