Mild and General Synthesis of Pyrrolo[2,1-<i>a</i>]isoquinolines and Related Polyheterocyclic Frameworks from Pyrrole Precursors Derived from a Mechanochemical Multicomponent Reaction
作者:Marco Leonardi、Mercedes Villacampa、J. Carlos Menéndez
DOI:10.1021/acs.joc.6b02995
日期:2017.3.3
synthesis performed under mechanochemical conditions with a TMSOTf-catalyzed oxonium-mediated cyclization gave general access to pyrrolo[2,1-a]isoquinoline derivatives under very mild conditions. The structural diversity generated by this method was extended by the preparation of six additional unusual polyheterocyclic frameworks.
在机械化学条件下进行的三组分,无溶剂吡咯合成与TMSOTf催化的氧鎓介导的环化反应的结合,可在非常温和的条件下获得吡咯并[2,1- a ]异喹啉衍生物。这种方法产生的结构多样性通过另外六个非常规多杂环骨架的制备得以扩展。
Logic design and synthesis of quinoxalines via the integration of iodination/oxidation/cyclization sequences from ketones and 1,2-diamines
作者:Mi Lian、Qi Li、Yanping Zhu、Guodong Yin、Anxin Wu
DOI:10.1016/j.tet.2012.09.056
日期:2012.11
A novel protocol for the synthesis of quinoxalines has been developed from simple ketones and 1,2-diamines. This process underwent a logic approach to bis-substituted quinoxalines via a consecutive iodination/Kornblum oxidation/cyclization in the presence of I2/CuO/DMSO and to mono-substituted quinoxalines via an iodination/cyclization/aromatization in the presence of I2/CuO/K3PO4·3H2O.
从简单的酮和1,2-二胺开发了一种新颖的喹喔啉合成方案。此过程通过连续碘化经历了一个逻辑方式双-取代的喹喔啉/ kornblum氧化反应/环化在我的存在2 /的CuO / DMSO中,并通过以单取代的喹喔啉碘化/环化/芳构化中的我的存在2 /的CuO / K 3 PO 4 ·3H 2 O.
Visible‐Light‐Driven Strain‐Increase Ring Contraction Allows the Synthesis of Cyclobutyl Boronic Esters
作者:Raffael Davenport、Mattia Silvi、Adam Noble、Zied Hosni、Natalie Fey、Varinder K. Aggarwal
DOI:10.1002/anie.201915409
日期:2020.4.16
There are a limited number of ring-contraction methodologies which convert readily available five-membered rings into strained four-membered rings. Here we report a photo-induced radical-mediated ringcontraction of five-membered-ring alkenyl boronate complexes into cyclobutanes. The process involves the addition of an electrophilic radical to the electron-rich alkenyl boronate complex, leading to
Merging Photoredox with 1,2-Metallate Rearrangements: The Photochemical Alkylation of Vinyl Boronate Complexes
作者:Mattia Silvi、Christopher Sandford、Varinder K. Aggarwal
DOI:10.1021/jacs.7b02569
日期:2017.4.26
Vinyl boronates react with electron-deficient alkyl iodides in the presence of visible light to give boronic esters in which two new C-C bonds have been created. The reaction occurs by radical addition of an electron-deficient alkyl radical to the vinyl boronate followed by electron transfer with another molecule of alkyl iodide, continuing the chain, and triggering a 1,2-metalate rearrangement. In
在可见光存在下,乙烯基硼酸酯与缺电子的烷基碘反应生成硼酸酯,其中产生了两个新的 CC 键。该反应通过将缺电子烷基自由基加成到硼酸乙烯酯上,然后与另一个烷基碘分子进行电子转移,继续链并引发 1,2-金属酸盐重排而发生。在许多情况下,使用光氧化还原催化剂可显着提高产率。自由基前体的范围包括α-碘酮、酯、腈、伯酰胺、α-氟化卤代乙酸酯和全氟烷基碘。