Direct Access to Halogenated Fused Imidazo[1,5-<i>a</i>
]<i>N</i>
-heteroaromatics through Copper-Promoted Double Oxidative C-H Amination and Halogenation
tandem reaction giving direct access to halogenated fused imidazo[1,5‐a]N‐heteroaromatics is described. The reaction uses 2‐methylazarenes and aliphatic amines or amino acids as starting materials, and involves a copper‐mediated double oxidative C–H amination and halogenation. In this strategy, copper salts serve as catalysts as well as halogen sources, and molecularoxygen is the sole oxidant.
描述了一种串联反应,可直接进入卤代稠合的咪唑并[1,5- a ] N-杂芳族化合物。该反应使用2-甲基苯乙烯和脂肪族胺或氨基酸作为起始原料,并涉及铜介导的双氧化CH-H胺化和卤化。在这种策略中,铜盐既是催化剂,又是卤素源,而分子氧是唯一的氧化剂。
Iodine-catalyzed direct C–H thiolation of imidazo[1,5-a]quinolines for the synthesis of 3-sulfenylimidazo[1,5-a]quinolines
作者:Song-Song Wu、Cheng-Tao Feng、Di Hu、Ye-Kai Huang、Zhong Li、Zai-Gang Luo、Shi-Tang Ma
DOI:10.1039/c6ob02736a
日期:——
An iodine-catalyzed regioselective sulfenylation of imidazo[1,5-a]quinolines was developed under metal- and oxidant-free reaction conditions. Using disulfides or thiophenols as sulfenylating agents, 3-sulfenylimidazo[1,5-a]quinoline derivatives were obtained in good to excellent yields with broad functional group tolerance. A multi-component reaction to generate 1-sulfenylated imidazo[1,5-a]pyridines
在无金属和无氧化剂的条件下,开发了碘催化的咪唑并[1,5- a ]喹啉的区域选择性亚磺酰基。使用二硫化物或硫酚作为亚磺酰化剂,可以良好的收率获得优异的3-亚磺酰基咪唑并[1,5- a ]喹啉衍生物,并且具有宽泛的官能团耐受性。还描述了产生1-亚磺酰化的咪唑并[1,5- a ]吡啶的多组分反应。初步生物学评估表明,某些3-亚磺酰化的咪唑并[1,5- a ]喹啉具有显着的抗癌活性。
A Metal‐ and Azide‐free Oxidative Coupling Reaction for the Synthesis of [1,2,3]Triazolo[1,5‐a]quinolines and their Application to Construct C−C and C‐P Bonds, 2‐Cyclopropylquinolines and Imidazo[1,5‐a]quinolines
one‐pot cascade oxidative annulation reaction has been developed for the synthesis of [1,2,3]triazolo[1,5‐a]quinolines from methyl azaarenes and N‐tosylhydrazines. The reaction has a broad substrate scope and can be easily scaled up to gram‐scale. 1,2,3‐Triazoles are an important skeletal structure for the construction of C−C and C−P bonds, 2‐cyclopropylquinolines and imidazo[1,5‐a]quinolines, for which different
The synthesis of imidazo[1,5-<i>a</i>]quinolines<i>via</i>a decarboxylative cyclization under metal-free conditions
作者:Zicong Yan、Changfeng Wan、Yu Yang、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c8ra03786h
日期:——
An iodine-mediated decarboxylative cyclization was developed from α-amino acids and 2-methyl quinolines under metal-free conditions, affording a variety of imidazo[1,5-a]quinolines with moderate to good yields.
Direct Arylation of Imidazo[1,5-<i>a</i>]azines Through Ruthenium and Palladium Catalysis
作者:Daniela Sustac Roman、Valentin Poiret、Guillaume Pelletier、André B. Charette
DOI:10.1002/ejoc.201403268
日期:2015.1
The regioselective RuII-catalyzed direct ortho-arylation of C-3 aryl-substituted imidazo[1,5-a]azines with (hetero)aryl halides was investigated. The employment of RuII and PdII catalysts in the same flask resulted in two sequential and distinct C–H bond arylations, which allowed the rapid synthesis of highly conjugated compounds.