Base-mediated [4+2] annulation of electron-deficient nitrobenzoheterocycles and α,α-dicyanoalkenes in water: Facile access to structurally diverse functionalized dibenzoheterocyclic compounds
A base-mediated [4 + 2] annulation of 2-nitrobenzofurans, 2-nitrobenzothiophenes, 3-nitrobenzothiophenes, and 3-nitroindoles with α,α-dicyanoalkenes for the synthesis of structurally diverse dibenzoheterocyclic compounds was developed. The reaction proceeded smoothly via a tandem vinylogous Michaeladdition/cyclization/tautomerization/elimination process in water with cesium carbonate as base, affording
A vinylogy concept driven highly diastereoselective cascade protocol towards [4,4]-carbospirocycles is developed by leveraging a spiro-annulation reaction through the thermodynamic enolate under organocatalysis.
Enantioselective Synthesis of Atropisomeric Biaryl Phosphorus Compounds by Chiral‐Phosphonium‐Salt‐Enabled Cascade Arene Formation
作者:Lixiang Zhu、Heling Peng、Yan Guo、Jixing Che、Jia‐Hong Wu、Zhishan Su、Tianli Wang
DOI:10.1002/anie.202202467
日期:2022.7.25
highly enantioselective organocatalytic cascade process has been developed for the synthesis of axially chiral 1,1′-biaryl phosphorus compounds. The approach involves multistep arene formation promoted by multifunctional phosphonium salt catalysis and proceeds through a complex Thorpe-type cycloaddition/oxidative hydroxylation/aromatization cascade with central-to-axial chirality transfer.