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 benzothiazonine by rhodium-catalyzed denitrogenative transannulation of 1-sulfonyl-1,2,3-triazole and thiochromone
作者:Saygbechi T. Jablasone、Zihang Ye、Shengguo Duan、Ze-Feng Xu、Chuan-Ying Li
DOI:10.1039/d1ob00419k
日期:——
A facile synthesis of functionalized benzothiazonine was achieved by rhodium-catalyzed denitrogenative annulation of easily available 1-sulfonyl-1,2,3-triazole and thiochromone.
Tandem Rh(II) and Chiral Squaramide Relay Catalysis: Enantioselective Synthesis of Dihydro-β-carbolines via Insertion to C–H Bond and Aza-Michael Reaction
作者:Shanmugam Rajasekar、Pazhamalai Anbarasan
DOI:10.1021/acs.orglett.9b00652
日期:2019.5.3
N-sulfonyl-1,2,3-triazoles has been developed for the enantioselectivesynthesis of dihydro-β-carbolines in good yield and enantioselectivity. The developed reaction involves selective insertion of in situ generated azavinyl rhodium carbene onto the C3–H bond of indole derivatives and subsequent squaramide-catalyzed enantioselective intramolecular aza-Michael reaction. Furthermore, the potential of the strategy
A novel Rh(II)-catalyzed transannulation of 1-tosyl-1,2,3-triazoles with silyl or alkyl enolethers has been developed, which enables the facile synthesis of substituted pyrroles in a regiocontrollable manner. Moreover, the methodology could be extended to access 3-pyrrolin-2-one derivatives with silyl ketene acetals used as the reaction partner.
One-Pot Transannulation of <i>N</i>-Sulfonyl-1,2,3-triazoles to Dihydro-β-carbolines and Dihydroisoquinolines via Rhodium-Catalyzed C–H Insertion-cum-Base-Mediated Aza-Michael Reaction
作者:Shanmugam Rajasekar、Pazhamalai Anbarasan
DOI:10.1021/acs.joc.9b00644
日期:2019.6.21
3-triazoles with a Michael acceptor-tethered indolederivative have been achieved for the synthesis of dihydro-β-carboline derivatives. The present methodology involves an efficient rhodium-catalyzed insertion of azavinyl carbenes to C3–H bond of indole followed by base-mediated intramolecular aza-Michael reaction. The optimized conditions tolerate various functional groups and afford the diverse dihydro-β-carbolines