Synthesis of indolo[2,3-c]coumarins and indolo[2,3-c]quinolinones via microwave-assisted base-free intramolecular cross dehydrogenative coupling
摘要:
A microwave-assisted base-free intramolecular cross dehydrogenative coupling (CDC) of 3-aniline substituted coumarins and quinolinones have been developed. A broad range of indolo[2,3-c]coumarins and indolo[2,3-c]quinolinones can be easily afforded in good to high yields (up to 93%) under palladium catalysis. The method is among the most straightforward and convenient ways to access these fused polyheterocycles. (C) 2018 Elsevier Ltd. All rights reserved.
A convenient protocol for the rapid and efficient synthesis of 3-(N-substituted) aminocoumarins is described. The synthetic route developed involves the Pd-catalyzed C–N coupling reaction from readily available 3-bromocoumarin derivatives in the presence of the catalytic system Pd(OAc)2/Xantphos. Under these conditions, a series of nucleophiles including amides, sulfonamides, carbamates and functionalized
Magnetically Retrievable Nano Crystalline Nickel Ferrite- Catalyzed Aerobic, Ligand-Free CN, CO and CC Cross- Coupling Reactions for the Synthesis of a Diversified Library of Heterocyclic Molecules
作者:Sanjay Paul、Koyel Pradhan、Sirshendu Ghosh、S. K. De、Asish R. Das
DOI:10.1002/adsc.201300686
日期:2014.4.14
A new nickel ferrite nano‐crystal‐catalyzed, ligand‐free strategy for the construction of CN, CO, and CC bonds is presented, in which easily available nitrogen and oxygen nucleophiles, aryl/heteroaryl halides and arylboronic acids are used for the cross‐couplingreactions. The reactions can be performed at low catalyst loadings with excellent functional group tolerance and chemoselectivity. A variety
Synthesis of indolo[2,3-c]coumarins and indolo[2,3-c]quinolinones via microwave-assisted base-free intramolecular cross dehydrogenative coupling
作者:Chang-Xue Gu、Wen-Wen Chen、Bin Xu、Ming-Hua Xu
DOI:10.1016/j.tet.2018.11.066
日期:2019.3
A microwave-assisted base-free intramolecular cross dehydrogenative coupling (CDC) of 3-aniline substituted coumarins and quinolinones have been developed. A broad range of indolo[2,3-c]coumarins and indolo[2,3-c]quinolinones can be easily afforded in good to high yields (up to 93%) under palladium catalysis. The method is among the most straightforward and convenient ways to access these fused polyheterocycles. (C) 2018 Elsevier Ltd. All rights reserved.