Visible-light-mediated selective thiocyanation/ipso-cyclization/oxidation cascade for the synthesis of thiocyanato-containing azaspirotrienediones
作者:Yuan Chen、Yu-Jue Chen、Zhi Guan、Yan-Hong He
DOI:10.1016/j.tet.2019.130763
日期:2019.12
visible-light-mediated metal-free thiocyanate radicaladdition/ipso-cyclization/oxidation cascade reaction for the synthesis of thiocyanato-containing azaspirotrienediones from N-phenylpropynamides is described. Cheap and readily available ammonium thiocyanate was used as a precursor to the thiocyanate freeradical, which undergoes a radicaladditionreaction with the alkyne, followed by selective ipso-cyclization
Palladium Nanoparticle-Catalyzed Stereoselective Domino Synthesis of All-Carbon Tetrasubstituted Olefin Containing Oxindoles via Carbopalladation/C–H Activation
作者:Naziya Parveen、Govindasamy Sekar
DOI:10.1021/acs.joc.0c00915
日期:2020.8.21
catalyzed single-step, stereoselective domino synthesis of symmetrically and unsymmetrically all-carbon tetrasubstituted olefin containing oxindoles from readily accessible anilides has been developed. The Pd-BNP catalyst showed a wide range of functional group tolerance that enabled building a library of heteroaromatics. This reusable Pd catalyst reflected its utility in the synthesis of biologically important
A visiblelight‐induced (blue LED) radical cascade has been devised to effect selenylative spirocyclization of N‐aryl alkynamides at room temperature under oxygen atmosphere and without the aid of external photocatalyst. The protocol is operationally simple, scalable, and offers clean synthesis of 3‐selenospiro[4,5]trienones in high yields (up to 92%). A novel spiro‐ring‐opening strategy has also been
Palladium-Catalyzed Intramolecular 5-<i>exo</i>-<i>dig</i> Hydroarylations of <i>N</i>-Arylpropiolamides: Thermodynamics-Controlled Stereoselective Synthesis of 3-Methyleneoxindoles
作者:Tao-Shan Jiang、Ri-Yuan Tang、Xing-Guo Zhang、Xin-Hua Li、Jin-Heng Li
DOI:10.1021/jo901963g
日期:2009.11.20
has been developed for the stereoselectivesynthesis of 3-(monosubstituted methylene)oxindoles. In the presence of Pd(OAc)2 and dppf, a variety of N-arylpropiolamides successfully underwent the intramolecular hydroarylation reaction to afford the corresponding 3-(monosubstituted-methylene)oxindoles in moderate to excellent yields. It is noteworthy that the stereoselectivity of the reaction can be controlled