Rhodium(
<scp>II</scp>
)‐Catalyzed [4+3] Cyclization of Triazoles with Indole Derivatives and Its Application in the Total Synthesis of (±)‐Aurantioclavine
作者:Shengguo Duan、Bing Xue、Hui Meng、Zihang Ye、Ze‐Feng Xu、Chuan‐Ying Li
DOI:10.1002/cjoc.202000657
日期:2021.5
rhodium(II)‐catalyzed [4+3] cyclization reaction of 1‐sulfonyl‐1,2‐3‐triazoles and indoles was developed. Azepino[5,4,3‐ cd]indoles, which are widely distributed in ergot alkaloids with various biological activities, could be obtained in good to excellent yields. In addition, the total synthesis of (±)‐aurantioclavine was completed in four steps from the known compound 1a adopting this [4+3] cyclization as a key step
开发了有效的铑(II)催化的1-磺酰基-1,2-3-3三唑和吲哚的[4 + 3]环化反应。可以以良好或极好的收率获得阿斯皮诺[5,4,3- cd ]吲哚,广泛分布在具有各种生物活性的麦角生物碱中。此外,采用这种[4 + 3]环化作为关键步骤,从已知化合物1a的四个步骤中完成了(±)-金葡糖醇的总合成。
Deoxygenative C2-heteroarylation of quinoline <i>N</i>-oxides: facile access to α-triazolylquinolines
作者:Geetanjali S Sontakke、Rahul K Shukla、Chandra M R Volla
DOI:10.3762/bjoc.17.42
日期:——
A metal- and additive-free, highly efficient, step-economical deoxygenative C2-heteroarylation of quinolines and isoquinolines was achieved from readily available N-oxides and N-sulfonyl-1,2,3-triazoles. A variety of α-triazolylquinoline derivatives were synthesized with good regioselectivity and in excellent yields under mild reaction conditions. Further, a gram-scale and one-pot synthesis illustrated
Sequential Functionalization of the OH and C(<i>sp</i><sup>2</sup>)O Bonds of Tropolones by Alkynes and<i>N</i>-Sulfonyl Azides
作者:Boram Seo、Woo Hyung Jeon、Chul-Eui Kim、Sanghyuck Kim、Sung Hong Kim、Phil Ho Lee
DOI:10.1002/adsc.201500829
日期:2016.3.31
Sequentialcopper‐catalyzed [3+2] cycloaddition, rhodium‐catalyzed OH insertion, intramolecular 1,8‐addition, and rearrangement starting from 1‐alkynes, N‐sulfonyl azides, and tropolones is demonstrated for the synthesis of the 2‐functionalized aminotropones in one pot. These results indicate that sequential functionalization of OH and C(sp2)O bonds smoothly occurs in the C(sp2)OH bonds of tropolone
Rh-Catalyzed Transannulation of <i>N</i>-Tosyl-1,2,3-Triazoles with Terminal Alkynes
作者:Buddhadeb Chattopadhyay、Vladimir Gevorgyan
DOI:10.1021/ol2014347
日期:2011.7.15
The first transannulation of 1,2,3-triazoles with terminal alkynes into pyrroles is reported. The reaction proceeds in the presence of a Rh2(oct)4/AgOCOCF3 binary catalyst system providing a straightforward approach to 1,2,4-trisubstituted pyrroles in good to excellent yields.
Rhodium-Catalyzed Denitrogenative [3+2] Cycloaddition: Access to Functionalized Hydroindolones and the Framework of Montanine-Type<i>Amaryllidaceae</i>Alkaloids
denitrogenative [3+2] cycloaddition of 1‐sulfonyl‐1,2,3‐triazoles with cyclic silyl dienol ethers has been developed for the synthesis of functionalized hydroindolones or their corresponding silyl ethers. The present method has been employed to construct synthetically valuable bicyclo[3.3.1]alkenone derivatives and pyrrolidine‐ring‐containing bicyclic indole compounds. As a further synthetic application, a stereoselective