Palladium catalyzed synthesis of annelated indoles
摘要:
The synthesis of polycyclic indoles is shown to be accomplished readily by the palladium catalyzed intramolecular cyclization of bromoaryl bearing indoles.
A highly diastereoselective dearomatization of indolesviapalladium-catalyzed decarboxylative alkynyl termination was developed. This protocol provides dissimilar tetracyclic and tetrasubstituted indoline scaffolds bearing congested stereocenters, which led to operationally simple conditions, short time, and broad substrate scope. Additionally, this reaction system could be scaled to gram quantities
Excited‐State Copper Catalysis for the Synthesis of Heterocycles
作者:Arghya Banerjee、Satavisha Sarkar、Jagrut A. Shah、Nicoline C. Frederiks、Emmanuel A. Bazan‐Bergamino、Christopher J. Johnson、Ming‐Yu Ngai
DOI:10.1002/anie.202113841
日期:2022.1.21
Visible-light-induced excited-state copper catalysis enables the synthesis of more than 10 distinct classes of heterocycles. The reaction tolerates a broad array of functional groups and complex molecular scaffolds, including derivatives of peptides, natural products, and marketed drugs.
Free radical reactions for heterocycle synthesis: formation of tri- and tetracyclic isoindolinones
作者:Wei Zhang、Georgia Pugh
DOI:10.1016/s0040-4039(99)01542-7
日期:1999.10
A general method for synthesis of tri- and tetracyclic isoindolinones is achieved by intramolecular freeradical cyclization.
合成三环和四环异吲哚啉酮的一般方法是通过分子内自由基环化来实现的。
Pd(0)-Catalyzed Dearomative Diarylation of Indoles
作者:David A. Petrone、Masaru Kondo、Nicolas Zeidan、Mark Lautens
DOI:10.1002/chem.201600118
日期:2016.4.11
We have developed a protocol for a Pd(0)‐catalyzed dearomative syn 1,2‐diarylation of indoles using readily available boroxines (dehydrated boronic acids) as coupling partners. This reaction proceeds efficiently using PtBu3 as the ligand to divergently access to fused indolines while minimizing the extent of direct Suzukicoupling. The scope of the reaction is remarkably broad and all products are
我们已经开发出了一种使用容易获得的硼氧烷(脱水硼酸)作为偶联伙伴,对吲哚进行Pd(0)催化的脱芳香基syn 1,2-二芳基化的方案。该反应使用P t Bu 3作为配体有效地进行,以发散地接近稠合的二氢吲哚,同时最小化直接铃木偶联的程度。反应的范围非常广泛,所有产物均以单一非对映异构体的形式获得,产率中等至优异。我们还编辑了一些数据,这些数据使底物和环硼氧烷的空间和电子特性与直接Suzuki偶联过程中经历所需的脱芳香性过程的倾向相平行。
Free radical reactions for heterocycle synthesis. Part 6: 2-Bromobenzoic acids as building blocks in the construction of nitrogen heterocycles
作者:Wei Zhang、Georgia Pugh
DOI:10.1016/s0040-4020(03)00381-8
日期:2003.4
A general method to construct a variety of nitrogen heterocycles is introduced. 2-Bromobenzoic acids or acid chlorides are used as the common building blocks to couple with appropriate nitrogen-containing compounds. Sequential aryl radical cyclizations including conjugate additions, spirocyclizations, homolytic and ipso aromatic substitutions, and 1,5-hydrogen atom transfers are employed to prepare