Access to Indole-Fused Polyheterocycles via Pd-Catalyzed Base-Free Intramolecular Cross Dehydrogenative Coupling
摘要:
A base-free process to access indole-fused polyheterocycles via a highly efficient and atom-economic palladium-catalyzed intramolecular cross dehydrogenetive coupling (CDC) reaction of 4-aniline substituted coumarins, quinolinones, and pyrones has been developed. A wide range of indolo[3,2-c]coumarins, indolo[3,2-c]quinolinones, and indolo[3,2-c]pyrones can be facilely afforded in good to excellent yields (up to 99%).
A regioselective synthesis of pentacyclic compounds containing coumarin, pyrrole, indene without catalysts under microwave irradiation
作者:Zhi-Wei Chen、Jun-Bo Hou、Zhao-Ran Dai、Xiao-Feng Yang
DOI:10.1016/j.cclet.2016.04.009
日期:2016.10
Abstract A concise and efficient approach was developed for the synthesis of pentacyclic compounds containing coumarin, pyrrole, indene in a regioselective manner in good yields via the reactions of N -substituted 4-aminocoumarin compounds and ninhydrin using microwave irradiation. No catalysts are required in our protocol.
A Novel and Facile Synthesis of N-Substituted 8-hydroxybenzo[g] chromeno[4, 3-b]indol-6(13H)-ones by a Nenitzescu Reaction
作者:Zhiwei Chen、Xiaodong Wang、Weike Su
DOI:10.2174/15701786113106660079
日期:2014.2
N-Substituted 8-hydroxybenzo[g]chromeno[4,3-b]indol-6(13H)-ones have been efficiently synthesized via a
Nenitzescu reaction of naphthoquinone (or benzoquinone) and N-substituted 4-aminocoumarins in the presence of a catalytic
amount of KHSO4 with a [bmim][BF4]/toluene system.
A Novel Transformation of 4-Arylaminocoumarins to 6<i>H</i>-1-Benzopyrano[4,3-b]quinolin-6-ones Under V ilsmeier-Haack Conditions
作者:K. Tabaković、I. Tabaković、N. Ajdini、O. Leci
DOI:10.1055/s-1987-27930
日期:——
4-Aryl and 4-alkylaminocoumarins 1 were prepared by reacting of 4-hydroxycoumarin and an appropriate amine. The reaction of 1 with phosphorusoxychloride/dimethylformamide led to 6 H-1-benzopyrano[4,3-b]quinoline-6-one derivatives 2 in very good yields, while 4-alkylaminocoumarins gave 3-formyl derivatives 3 under Vilsmeier-Haack conditions.