An umpolung approach toward N-aryl nitrone construction: a phosphine-mediated addition of 1,2-dicarbonyls to nitroso electrophiles
作者:Aditi P. Chavannavar、Allen G. Oliver、Brandon L. Ashfeld
DOI:10.1039/c4cc05044d
日期:——
An umpolung strategy toward the chemoselective construction ofN-aryl nitrones employing a phosphine-mediated addition of 1,2-dicarbonyls to nitroso arenes is described.
一种通过膦介导的1,2-二羰基物质加到亚硝基芳烃的化学选择性构建N-芳基亚硝酮的反相策略被描述。
Copper-Catalyzed [3+2] Cycloaddition and Interrupted Fischer Indolization to Prepare Polycyclic Furo[2,3-b]indolines from <i>N</i>
-Aryl Isatin Nitrones and Methylenecyclopropanes
作者:Si-Yi Wu、Wei-Li Chen、Xiao-Pan Ma、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1002/adsc.201801327
日期:2019.3.5
3‐b]indolines containing a cyclopropane ring have been prepared in moderate yields with high diastereoselectivityfrom N‐aryl isatin nitrones and methylenecyclopropanes using a copper‐catalyzed [3+2] cycloaddition and subsequent interrupted Fischer indolization strategy under mild reaction conditions. The obtained furo[2,3‐b]indolines were easily converted to piperidinone‐fused furo[2,3‐b]indolines by
Synthesis of Spirooxindole‐Benzo[d]oxazoles and Dihydrobenzofurans through Cycloaddition and Rearrangement of
<i>N</i>
‐Vinyl Nitrones and Arynes
作者:Hao Yuan、Dong‐Liu Lu、Cui Liang、Dong‐Liang Mo
DOI:10.1002/adsc.202101372
日期:2022.4.12
[3+2] cycloaddition and selective rearrangement of N-vinyl oxindole nitrones and arynes under transition metal-free conditions. Experimental results showed that the substituent on the nitrone N-vinyl group controlled the [1,3]- or [3,3]-rearrangement of their cycloadduct owing to its steric effect. The present method features broad substrate scope, good functional group tolerance, controllable [1,3]-
Synthesis of Bridged Cycloisoxazoline Scaffolds via Rhodium-Catalyzed Coupling of Nitrones with Cyclic Carbonate
作者:Man Zhu、Mengdie Zhu、Fangjie Wei、Chongjing Shao、Xingwei Li、Bingxian Liu
DOI:10.1021/acs.joc.3c01840
日期:2023.12.1
Bridged isoxazolidines were synthesized via Rh(III)-catalyzed C–H allylation of α-aryl nitrones with 5-methylene-1,3-dioxan-2-one. The nitrone group serves as a directing group and 1,3-dipole in the C–H activation/[3 + 2] cycloaddition cascade, exhibiting excellent chemo- and stereoselectivity along with good functional group compatibility. The resulting skeletal structure was conveniently modified
Synthesis of Spirooxindole-1,2-oxazinan-5-ones through 2,2,2-Trifluoroethanol Promoted [3 + 3] Cycloaddition of <i>N</i>-Vinyl Oxindole Nitrones and Oxyallyl Cations
作者:Hao Yuan、Yu-Zheng Wu、Yu-Han Fang、Chun-Hua Chen、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.joc.3c01477
日期:2023.12.1
2-trifluoroethanol (TFE)-promoted [3 + 3] cycloaddition of N-vinyl oxindole nitrones with oxyallylcations generated from α-tosyloxy ketones under mild reaction conditions. Mechanistic studies revealed that [3 + 3] cycloaddition might involve two possible reaction pathways, including direct [3 + 3] cycloaddition of N-vinyl oxindole ntirones with oxyallylcations, or the addition of TFE to N-vinyl oxindole