Synthesis of 3-Pyrrolin-2-ones by Rhodium-Catalyzed Transannulation of 1-Sulfonyl-1,2,3-triazole with Ketene Silyl Acetal
作者:Rui-Qiao Ran、Jun He、Shi-Dong Xiu、Kai-Bing Wang、Chuan-Ying Li
DOI:10.1021/ol501514b
日期:2014.7.18
α-Imino rhodium carbenoids generated from 1-sulfonyl 1,2,3-triazole were applied to the 3 + 2 cycloaddition with ketene silyl acetal, offering a novel and straightforward synthesis of biologically interesting compound 3-pyrrolin-2-one with broad substrate scope.
Synthesis of Multifunctionalized 2-Carbonylpyrrole by Rhodium-Catalyzed Transannulation of 1-Sulfonyl-1,2,3-triazole with β-Diketone
作者:Wanli Cheng、Yanhua Tang、Ze-Feng Xu、Chuan-Ying Li
DOI:10.1021/acs.orglett.6b03179
日期:2016.12.2
A facile rhodium-catalyzed transannulation of 1-sulfonyl-1,2,3-triazoles with β-diketones was realized, and a series of multisubstituted 2-carbonylpyrroles were synthesized efficiently (up to 94% yield). The protocol features several advantages, such as readily available materials, mild reaction conditions, a concise operating procedure, a broad reaction scope, and excellent regioselectivity when benzoylacetone
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。