Radical Aza-Cyclization of α-Imino-oxy Acids for Synthesis of Alkene-Containing <i>N</i>-Heterocycles via Dual Cobaloxime and Photoredox Catalysis
作者:Jia-Lin Tu、Jia-Li Liu、Wan Tang、Ma Su、Feng Liu
DOI:10.1021/acs.orglett.0c00224
日期:2020.2.7
Nitrogen-containing heterocycles are prevalent in both naturally and synthetically bioactive molecules. We report herein an unprecedented protocol for radical aza-cyclization of α-imino-oxy acids with pendant alkenes via synergistic photoredox and cobaloxime catalysis. With or without alkenes as the intermolecular cross-coupling partners, the transformation provides a variety of corresponding alkene-containing dihydropyrrole
reductive cross-coupling of unsaturated oxime esters with readily available arylhalides, providing an expedient approach for constructing pyrroline derivatives. The absence of organometallic reagents enables the reaction to occur under mild conditions with a broad substrate scope and good functional group tolerance. Moreover, other C-based electrophiles, including alkenyl, alkynyl and alkylhalides, or
在此,我们公开了通过镍催化的不饱和肟酯与容易获得的芳基卤化物的还原交叉偶联对烯烃进行一般且实用的亚氨基化,为构建吡咯啉衍生物提供了一种权宜之计。不存在有机金属试剂使反应能够在温和的条件下发生,具有广泛的底物范围和良好的官能团耐受性。此外,其他基于 C 的亲电子试剂,包括烯基、炔基和烷基卤化物或假卤化物,也是该反应的合适底物。
Palladium Catalyzed Cyclizations of Oxime Esters with 1,2-Disubstituted Alkenes: Synthesis of Dihydropyrroles
作者:Nicholas J. Race、John F. Bower
DOI:10.1021/ol4023112
日期:2013.9.6
Pd-catalyzed cyclizations of oxime esters with 1,2-dialkylated alkenes provide an entry to chiral dihydropyrroles. Substrate and catalyst controlled strategies for selective product formation (vs alternative pyrroles) are outlined.