Asymmetric construction of spirocyclohexanonerhodanines catalyzed by simple diamine derived from chiral tert-leucine
作者:Wenbin Wu、Huicai Huang、Xiaoqian Yuan、Kailong Zhu、Jinxing Ye
DOI:10.1039/c2cc34321e
日期:——
A diamine-catalyzed asymmetric tandem reactionbetweenalpha,beta-unsaturatedketones and rhodanine derivatives has been developed to synthesize various spirocyclic compounds with high stereoselectivities (up to 99% ee and >20:1 dr). The products obtained contain two pharmaceutically relevant features: the biologically active rhodanine moiety embedded in a spirocyclic unit.
Yb(OTf)<sub>3</sub> Anchored on Crosslinked Chitosan Microsphere: A Green Heterogenized Catalyst for the Synthesis of Bispiro‐Fused Heterocycles
作者:Lin Chen、Wen‐Ya Jiao
DOI:10.1002/ejoc.202300041
日期:2023.5.12
Yb(OTf)3 anchored on crosslinked chitosan microsphere (Yb(OTf)3@CCM) was prepared by facile processes. Using Yb(OTf)3@CCM as a green heterogeneous catalyst, the three-component [3+2] cycloaddition of isatins, tetrahydroisoquinolines and 5-alkenyl rhodanines was developed, which gave access to a suite of architecturally complex bispiro-fused heterocycles merging four pharmacophores.