A novel multicomponent reaction to synthesize substituted furo[3,2-c]chromenes via a Pd-catalyzed cascade process
作者:Lizhi Zhao、Gang Cheng、Youhong Hu
DOI:10.1016/j.tetlet.2008.10.025
日期:2008.12
A novel one-pot three-component reaction for the synthesis of multisubstituted furo[3,2-c]chromenes using 3-(1-alkynyl)chromones, aryl iodides, and alcohols is developed via Pd-catalyzed cascade 1,4-addition and cyclization. This synthetic approach efficiently generates two C–O bonds and one C–Cbond to construct diverse furo[3,2-c]chromenes structures.
通过钯催化的级联1,4-加成反应,开发了一种新颖的一锅三组分反应,该反应可使用3-(1-炔基)色酮,碘代芳基和醇类合成多取代的呋喃并[3,2- c ]色烯。和环化。这种合成方法可以有效地产生两个C–O键和一个C–C键,以构建不同的呋喃[3,2- c ]苯二甲基结构。
Base-Promoted One-Pot Tandem Reaction of 3-(1-Alkynyl)chromones under Microwave Irradiation to Functionalized Amino-Substituted Xanthones
作者:Yang Liu、Liping Huang、Fuchun Xie、Youhong Hu
DOI:10.1021/jo1013614
日期:2010.9.17
A base-promoted one-pot tandemreaction has been developed from 3-(1-alkynyl)chromones with various acetonitriles to afford functionalized amino-substituted xanthones 3 under microwave irradiation. This tandem process involves multiple reactions, such as Michael addition/cyclization/1,2-addition, without a transition metal catalyst. This method provides an efficientapproach to build up natural product-like
A Base-Promoted Tandem Reaction of 3-(1-Alkynyl)chromones with 1,3-Dicarbonyl Compounds: An Efficient Approach to Functional Xanthones
作者:Lizhi Zhao、Fuchun Xie、Gang Cheng、Youhong Hu
DOI:10.1002/anie.200902618
日期:2009.8.17
No need for a transition‐metal catalyst is characteristic for the tandem process presented herein to obtain functionalizedxanthones. The sequence involves multiple reactions, such as Michael addition‐elimination/cyclization/1,2‐addition/elimination reactions (see scheme).
A base-promoted desalicyloylative dimerization of 3-(1-alkynyl)chromones: An unusual approach to 2-alkynyl xanthones
作者:Fuchun Xie、Xuan Pan、Shijun Lin、Youhong Hu
DOI:10.1039/b925234g
日期:——
A novel base-promoted cascade desalicyloylative dimerization of 3-(1-alkynyl)chromones to produce 2-alkynyl xanthones has been developed. This tandem process involves multiple reactions, such as Michael additions/cyclizations/desalicyloylation without a transition metal catalyst and inert atmosphere.
Two Efficient Cascade Reactions to Synthesize Substituted Furocoumarins
作者:Gang Cheng、Youhong Hu
DOI:10.1021/jo800439y
日期:2008.6.1
We have developed two efficient one-pot reactions to generate furo[3,2-c]coumarins and chlorofuro[3,2-c]coumarins through addition/cyclization/oxidation and chlorination. One cascade addition/cyclization/oxidation sequence of 1 with H2O in the presence of 20% CuCl as Lewis acid under an air atmosphere generated the 2-substituted-4H-furo[3,2-c]chromen-4-one 2. Another sequence in the presence of 10% CuBr and excess CuCl2 as the oxidant afforded the 3-chloro2-substituted-4H-furo[3,2-c]chromen-4-one 3.