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.
Copper-Catalyzed Cyclization for Access to 6<i>H</i>-Chromeno[4,3-<i>b</i>]quinolin-6-ones Employing DMF as the Carbon Source
作者:Yiyi Weng、Hao Zhou、Chen Sun、Yuanyuan Xie、Weike Su
DOI:10.1021/acs.joc.7b01515
日期:2017.9.1
The first example of the copper-catalyzed cyclization of 4-(phenylamino)-2H-chromen-2-ones employing the N-methyl moiety of DMF as the source of the methine (CH) group has been developed, providing an efficient synthetic pathway to access novel functionalized 6H-chromeno[4,3-b]quinolin-6-ones in moderate to good yields.
Checchi,S. et al., Gazzetta Chimica Italiana, 1969, vol. 99, p. 501 - 513
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.