Palladium catalyzed synthesis of 2-trifluoromethylquinolines through a domino Sonogashira–alkyne carbocyclization process
作者:Zixian Chen、Jiangtao Zhu、Haibo Xie、Shan Li、Yongming Wu、Yuefa Gong
DOI:10.1039/b925285a
日期:——
A new, rapid and high-yielding method to prepare 3,4-disubstituted 2-trifluoromethylquinolines by a palladiumcatalyzed tandem Sonogashira-alkyne carbocyclization of beta-trifluoromethyl beta-enaminoketones with arynes is described. Moderate to excellent yields have been achieved under mild conditions. This reaction can also be expanded to the non-fluorine containing substrates. The reaction mechanism
Polysubstituted quinolines have been prepared, usually in good to high yields, from readily available 2-alkynylanilines and α,β-ynones through a sequential process that omits the isolation of the enaminone intermediates. The reaction tolerates several useful functionalities including ether, cyano, ester, and chloro substituents.
A novel and expedient one-pot synthesis of thiazino[2,3,4-hi]indole derivatives from o-haloaryl enamines and o-bromothiophenols has been developed. The tandem oxidativecoupling/heteroannulation reactions exhibit high selectivity and good efficiency. The polycyclic heterocyclic products obtained might be useful in medicinal chemistry and materials science.
已经开发了一种新颖且简便的由邻卤代芳基烯胺和邻溴代苯硫酚合成噻嗪[ 2,3,4 - hi ]吲哚衍生物的方法。串联氧化偶联/杂环化反应显示出高选择性和良好效率。获得的多环杂环产物可能在药物化学和材料科学中有用。
Selective Thiocyanation and Aromatic Amination To Achieve Organized Annulation of Enaminone with Thiocyanate