Practical and Scalable Synthesis of Borylated Heterocycles Using Bench-Stable Precursors of Metal-Free Lewis Pair Catalysts
作者:Arumugam Jayaraman、Luis C. Misal Castro、Frédéric-Georges Fontaine
DOI:10.1021/acs.oprd.8b00248
日期:2018.11.16
A practical and scalable metal-free catalytic method for the borylation and borylative dearomatization of heteroarenes has been developed. This synthetic method uses inexpensive and conveniently synthesizable bench-stable precatalysts of the form 1-NHR2-2-BF3-C6H4, commercially and synthetically accessible heteroarenes as substrates, and pinacolborane as the borylation reagent. The preparation of several
已开发出一种实用且可扩展的无杂芳烃的硼化和硼基脱芳香化的无金属催化方法。这种合成方法使用廉价且可方便合成的1-NHR 2 -2-BF 3 -C 6 H 4形式的台式稳定型预催化剂。,市售和合成途径可得到的杂芳烃作为底物,频哪醇硼烷作为硼化试剂。在无溶剂条件下,无需使用Schlenk技术或手套箱即可制备2和50 g规模的数个硼化杂环。使用这种经济高效的绿色方法还可以实现其中一种杂芳烃底物的公斤级硼化,这证明了我们的方法可以在精细化工行业中方便地实施的事实。
Silver‐Catalyzed Asymmetric Dearomatization of Electron‐Deficient Heteroarenes via Interrupted Barton–Zard Reaction
作者:Qian Wan、Jia‐Hao Xie、Chao Zheng、Yao‐Feng Yuan、Shu‐Li You
DOI:10.1002/anie.202107767
日期:2021.9
Herein we report a catalytic asymmetricdearomatizationreaction of electron-deficient heteroarenes with α-substituted isocyanoacetates through an interrupted Barton–Zard reaction. A range of optically active pyrrolo[3,4-b]indole derivatives was obtained in good yields (up to 97 %) with high stereoselectivities (up to >20:1 dr and 97 % ee), using a catalytic system consisting of a cinchona-derived
Metal-free borylative dearomatization of indoles: exploring the divergent reactivity of aminoborane C–H borylation catalysts
作者:Arumugam Jayaraman、Luis C. Misal Castro、Vincent Desrosiers、Frédéric-Georges Fontaine
DOI:10.1039/c8sc01093e
日期:——
1-arylsulfonyl indoles with pinacolborane in a syn addition fashion, with H and Bpin groups added respectively to the 2 and 3 positions of indoles. Catalysis proceeds with good to excellent conversion and essentially with complete regio- and diastereoselectivity. From mechanistic insights and DFT computations, we realized and established that prototypical boranes can also catalyze this borylative dearomatization
尽管通过碳-硼键形成反应使吲哚脱芳香化是新的且很有前途,但到目前为止,它们主要是金属催化的。在这里,我们建立了使用无金属催化剂以原子有效方式促进此类反应的方法。该原位生成的两亲性氨基硼烷催化剂(1-PIP-2-BH 2 -C 6 H ^ 4)2(PIP =哌啶基)促进与频哪醇的各种1-芳基磺酰基吲哚的脱芳构化borylative在一个顺H和BPIn基团分别添加到吲哚的2和3位上。催化进行的转化具有良好至优异的转化率,并且基本上具有完全的区域选择性和非对映选择性。从力学的见解和DFT计算中,我们认识到并确定原型硼烷也可以催化这种硼基脱芳香化反应。
Synthesis of α-substituted indolylacetamide using acetonitriles as acetamide enolate equivalents through O-transfer reactions
作者:Takumi Abe、Kenta Noda、Daisuke Sawada
DOI:10.1039/d1cc02821a
日期:——
ammonium hemiaminals as O-transfer reagents and commercially available acetonitriles as a primary amide enolate precursor. The combination serves as an amide enolate equivalent, thereby providing one-pot access to α-substituted indolylacetamides. A broad substrate scope and good functional group tolerance as well as gram-scale synthesis make this protocol highly attractive. Mechanistic experiments suggest
我们引入了现成的铵半胺作为 O 转移试剂和市售的乙腈作为伯酰胺烯醇前体。该组合用作酰胺烯醇化物等价物,从而提供对α-取代的吲哚基乙酰胺的一锅法访问。广泛的底物范围和良好的官能团耐受性以及克级合成使该协议极具吸引力。机理实验表明,在无金属条件下,氰基被半胺的羟基捕获,并在途中形成所需的伯酰胺。
Synthesis and biological evaluation of novel C-indolylxylosides as sodium-dependent glucose co-transporter 2 inhibitors
Sodium-dependent glucose co-transporter 2 (SGLT2) inhibitors are the current focus on the indication for the management of hyperglycemia in diabetes. Here, a novel series of C-linked indolylxyloside-based inhibitors of SGLT2 has been discovered. Structure-activity relationship studies revealed that substituents at the 7-position of the indole moiety and a p-cyclopropylphenyl group in the distal position were necessary for optimum inhibitory activity. The pharmacokinetic study demonstrates that the most potent compound 1i is metabolically stable with a low clearance in rats. In further efficacy study, 1i is found to significantly lower blood glucose levels of streptozotocin (STZ)-induced diabetic rats. (C) 2012 Elsevier Masson SAS. All rights reserved.