Zn(II)-Catalyzed One-Pot Synthesis of Coumarins from Ynamides and Salicylaldehydes
作者:Huen Ji Yoo、So Won Youn
DOI:10.1021/acs.orglett.9b01181
日期:2019.5.3
A highly efficient and straightforward synthesis of diversely substituted coumarins from ynamides and salicylaldehydes in the presence of Zn(II) catalyst has been developed. The sulfonamide moiety of ynamides was successfully recycled in this process, serving as an effective traceless directing group for high regioselectivity in the bond-forming event. The advantages of this protocol are good functional
Pd/Pivalic Acid Mediated Direct Arylation of 2-Pyrones and Related Heterocycles
作者:Leticia M. Pardo、Aisling M. Prendergast、Marie-T. Nolan、Eoin Ó Muimhneacháin、Gerard P. McGlacken
DOI:10.1002/ejoc.201500262
日期:2015.6
Directarylation represents a favourable alternative to traditional cross-coupling reactions and has found widespread use with simple aryls and robust heterocycles. Herein a directarylation protocol has been optimised and applied to more delicate, privileged biological motifs. The intramolecular directarylation of 2-pyrones, 2-coumarins, 2-pyridones and 2-quinolones occurs in very good to excellent