Pd-Catalyzed Efficient Synthesis of Azacoumestans Via Intramolecular Cross Coupling of 4-(Arylamino)coumarins in the Presence of Copper Acetate under Microwaves
Pd-Catalyzed Efficient Synthesis of Azacoumestans Via Intramolecular Cross Coupling of 4-(Arylamino)coumarins in the Presence of Copper Acetate under Microwaves
An environmentally-benign electrochemical approach for the construction of quinoline derivatives employing N,N-dimethylformamide (DMF) as the methine source has been devised by cyclization of 4-(phenylamino)-2H-chromen-2-ones. In a user-friendly undivided cell, 6H-chromeno[4,3-b]quinolin-6-ones were obtained under chemical oxidant-free and transition-metal-free conditions in 43–92% yields with high
已经通过 4-(苯基氨基) -2H -chromen-2-ones的环化设计了一种环境友好的电化学方法,用于构建使用N,N-二甲基甲酰胺 (DMF) 作为次甲基源的喹啉衍生物。在用户友好的无隔膜电解槽,6H -chromeno [4,3- b ]喹啉-6-酮进行化学氧化剂-自由和过渡金属-自由条件下在具有高功能性公差43-92%的产率获得。
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.
Synthesis of Functionalized Coumarins and Quinolinones by NHC-Catalyzed Annulation of Modified Enals with Heterocyclic C–H Acids
作者:Santhivardhana Reddy Yetra、Tony Roy、Anup Bhunia、Digvijay Porwal、Akkattu T. Biju
DOI:10.1021/jo500693h
日期:2014.5.2
N-Heterocyclic carbene (NHC) catalyzed lactonization and lactamization of 2-bromoenals with heterocyclic C–H acids proceeding via the α,β-unsaturated acyl azolium intermediates is reported. The reaction furnished coumarin- or quinolinone-fused lactone/lactam derivatives. In addition, results of the enantioselective version of this reaction using chiral NHC are presented.
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.