Terminal methyl as a one-carbon synthon: synthesis of quinoxaline derivatives<i>via</i>radical-type transformation
作者:Xinfeng Wang、Huanhuan Liu、Caixia Xie、Feiyu Zhou、Chen Ma
DOI:10.1039/c9nj04910j
日期:——
pyrrolo[1,2-a]quinoxaline derivatives has been developed. Ferric chloride served as a promoter and as a Lewis acid in the reaction. Solvents provided the corresponding carbon sources simultaneously. The majority of solvents with terminal methyl groups, including ethers, amines and dimethyl sulfoxide, were reactive in the synthesis of quinoxaline derivatives at a certain yield via C–H(sp3) amination/C–O
已经开发了铁促进的吡咯并[1,2- a ]喹喔啉衍生物的构建方法。氯化铁在反应中用作促进剂和路易斯酸。溶剂同时提供了相应的碳源。大多数带有末端甲基的溶剂,包括醚,胺和二甲基亚砜,在通过C–H(sp 3)胺化/ C–O或C–N(C–S )分裂。该方法适用于多种吡咯并[1,2- a ]喹喔啉和吲哚并[1,2- a ]喹唑啉底物。
Ruthenium-Catalyzed Synthesis of Pyrrolo[1,2-a]quinoxaline Derivatives from 1-(2-Aminophenyl)pyrroles and Sulfoxonium Ylides
A ruthenium-catalyzed [5+1] annulation of 1-(2-aminophenyl)pyrroles with α-carbonyl sulfoxonium ylides is reported. This reaction provides a one-step method for synthesizing pyrrolo[1,2-a]quinoxaline derivatives under ambient conditions. The system proceeds with a short reaction time and a high functional-group tolerance. Notably, this divergent protocol tolerates β-keto sulfoxonium ylides and can
Annulation of 1-(2-Aminoaryl)pyrroles, Ethers with Elemental Sulfur To Give 1,3,6-Benzothiadiazepine Derivatives through Double C–S Bond Formation and C–O Cleavage of Ethers
作者:Jie Zhang、Chuwen Song、Linfeng Sheng、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.8b03187
日期:2019.2.15
An efficient three-component reaction of 1-(2-aminoaryl)pyrroles, ethers, and elemental sulfur for constructing N-heterocycle-fused 1,3,6-benzothiadiazepines under transition-metal-free conditions has been developed. Ethers act as both reactants and solvent in this reaction. The method proceeds efficiently over a broad range of substrates with good functional group tolerance.
A PPTS (pyridinium p‐toluenesulfonate)‐catalyzed bicyclization reaction of 2‐isocyanobenzaldehydes as 1,5‐dielectrophiles with various amines has been developed. The reaction not only provides a simple and efficient strategy for the assembly of structurally diverse fused quinazoline derivatives from readily available substrates under metal‐free and mild conditions in a single step with only water and
Facile Assembly of Fused Isoquinolines by Gold(I)-Catalyzed Coupling-Cyclization Reactions between o-Alkynylbenzaldehydes and Aromatic Amines Containing Tethered Nucleophiles
作者:Nitin T. Patil、Anil Kumar Mutyala、Pediredla G. V. V. Lakshmi、Penmatcha V. K. Raju、Balasubramanian Sridhar
DOI:10.1002/ejoc.200901364
日期:2010.4
A gold(I)-catalyzed, operationally simple coupling-cyclization technique was developed for the synthesis of isoquinoline-fused polycyclic compounds. The reaction makes use of two coupling partners such as o-alkynylbenzaldehydes and aromaticamines having tetherednucleophiles. The reaction is easy to perform, broad in scope, and allows the generation of a number of biologically important heterocyclic