A copper(<scp>ii</scp>) perchlorate-promoted tandem reaction of internal alkynol and salicyl N-tosylhydrazone: direct access to isochromeno[3,4-b]chromene
作者:Hai Xiao Siyang、Xu Rui Wu、Xiao Yue Ji、Xin Yan Wu、Pei Nian Liu
DOI:10.1039/c4cc02862g
日期:——
A copper(ii) perchlorate-promoted tandem reaction of internal alkynol and salicyl N-tosylhydrazone provides a novel, concise method for constructing isochromeno[3,4-b]chromene in 35-94% yields. The tandem reaction involves cycloisomerization, formal [4+2] cycloaddition and an elimination process.
Cascade reaction of alkynols with 1-(2-aminophenyl)prop-2-ynols to form a fused 5,5,6-tricyclic system: formation of four bonds in a single reaction
作者:Xiao-Feng Mao、Xiao-Ping Zhu、Deng-Yuan Li、Liang-Liang Jiang、Pei-Nian Liu
DOI:10.1039/c7cc04126h
日期:——
cascade reaction of internal alkynols with 1-(2-aminophenyl)prop-2-ynols has been developed to form a new N,O-containing fused 5,5,6-tricyclic skeleton. Mechanistic studies indicate that this reaction proceeds via alkynol cycloisomerization, intermolecular substitution with 1-(2-aminophenyl)prop-2-ynols, conjugated addition with alkynols and consequent cyclizations. In this way, two C-C bonds, one C-O