Efficient Construction of a 3C-Xanthone-Linked 3C-Chromone Scaffold by Novel Double Michael Additions and Cyclizations
摘要:
A novel base-promoted cascade reaction of 2-methyl-3-(1-alkynyl)chromones to produce a 3C-xanthone-linked 3C-chromone scaffold has been developed. This tandem process involves multiple reactions such as Michael additions/cyclizations under mild conditions without a transition metal catalyst and inert atmosphere.
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
Synthesis of novel functional polycyclic chromones through Michael addition and double cyclizations
作者:Yang Liu、Liping Huang、Fuchun Xie、Xuxing Chen、Youhong Hu
DOI:10.1039/c0ob01000f
日期:——
2-halobenzylic nitriles (esters or amides) for the synthesis of novel functional polycyclic chromenones has been developed. This tandem process involves multiple reactions, such as Michael addition and double cyclizations without a transition metal catalyst.
Phase Transfer Reagent Promoted Tandem Ring-Opening and Ring-Closing Reactions of Unique 3-(1-Alkynyl) Chromones
作者:Yang Liu、Shiyu Jin、Liping Huang、Youhong Hu
DOI:10.1021/acs.orglett.5b00721
日期:2015.5.1
promoted tandem ring-opening and ring-closing reaction of 3-(1-alkynyl) chromones has been developed. This process remarkably generates functionalized 3-acyl-2-substituted chromones. Interestingly, when 3-(hepta-1,6-diyn-1-yl)chromone derivatives are applied, a novel tetracyclic chromone scaffold can be obtained by a further intramolecular 4 + 2 cyclization.
An Efficient Approach to Functionalized Benzo[<i>a</i>]xanthones through Reactions of 2-Methyl-3-(1-alkynyl)chromones with Electron-Deficient Chromone-Fused Dienes
作者:Jian Gong、Fuchun Xie、Hong Chen、Youhong Hu
DOI:10.1021/ol101496w
日期:2010.9.3
An efficienttandem process was developed to synthesize diversified benzo[a]xanthones from 2-methyl-3-(1-alkynyl)chromones with electron-deficient chromone-fused dienes. This unusual reaction, involving multiple steps and not requiring the use of transition metal catalysts or an inert atmosphere, results in the formation of three new C−C bonds and one C−O bond.
开发了一种有效的串联方法,以从2-甲基-3-(1-炔基)色酮与电子不足的色酮稠合二烯合成多种苯并[ a ]氧杂蒽。这种不寻常的反应涉及多个步骤,不需要使用过渡金属催化剂或惰性气氛,导致形成三个新的C-C键和一个C-O键。
CuBr-catalyzed cascade reaction of 2-substituted-3-(1-alkynyl)chromones to synthesize functionalized 3-acylfurans
作者:Liping Huang、Feng Hu、Qingdong Ma、Youhong Hu
DOI:10.1016/j.tetlet.2013.04.070
日期:2013.6
A highly efficient CuBr-catalyzed domino reaction of 2-substituted-3-(1-alkynyl)chromones to synthesize functionalized 3-acylfurans has been developed. The reaction is mild, environmentally friendly and easily handled without the necessity for dry solvents and inert atmosphere. (C) 2013 Elsevier Ltd. All rights reserved.