Rhodium-catalyzed denitrogenative thioacetalization of N-sulfonyl-1,2,3-triazoles with disulfides: an entry to diverse transformation of terminal alkynes
with exclusive regioselectivity and stereoselectivity. Functional application of such a resultant product by oxidative addition and epoxidation is also explored. Notably, the treatment of a pyrroline-fused N-glycoside (3a) with TMSOTf efficiently leads to an interesting unexpected C-nucleoside (9) via a TMSOTf-inducing ring opening/acetyl migration/ringclosingreaction sequence.
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。
Rh(II) Catalyzed High Order Cycloadditions of 8-Azaheptafulvenes with <i>N</i>-Sulfonyl 1,2,3-Triazloes or α-Oxo Diazocompounds
作者:Wei Chen、Ya-Li Bai、Yong-Chun Luo、Peng-Fei Xu
DOI:10.1021/acs.orglett.6b03542
日期:2017.1.20
A novel strategy was developed for the application of Rh carbenes generated from readily accessible N-sulfonyl 1,2,3,-triazoles or diazocompouds in the high order cycloadditions, which offered an efficient route to a variety of N-containing medium-sized rings. The process provided a wide range of cyclohepta[b]pyrazine and cyclohepta[b]pyrrolone derivatives with high yields.
已开发出一种新的策略,用于将由易于获得的N-磺酰基1,2,3,-三唑或重氮化合物生成的Rh卡宾化合物以高阶环加成的形式应用,这为连接各种含N的中型环提供了一条有效途径。该方法以高收率提供了多种环庚[ b ]吡嗪和环庚[ b ]吡咯烷酮衍生物。
Copper(I)–N-Heterocyclic Carbene Complexes as Efficient Catalysts for the Synthesis of 1,4-Disubstituted 1,2,3-Sulfonyltriazoles in Air
作者:Faïma Lazreg、Catherine S. J. Cazin
DOI:10.1021/acs.organomet.7b00506
日期:2018.3.12
Bis-NHC and mixed NHC/PR3 copper(I) complexes (NHC = N-heterocyclic carbene) were found to be efficientcatalysts enabling the azide–alkyne cycloaddition reaction leading to the formation of 1,2,3-sulfonyltriazoles under Click conditions. The mechanism of this transformation was probed and decoordination of the NHC ligand (even in the NHC/PR3 mixed ligand systems) during the catalytic transformation