N-Heterocycles by Cyclization of 2′-Nhr-Chalcones, 2′ -Nhr-Chalcone Dibromides and 2′-Nhr-α-Azidochalcones
摘要:
Syntheses of six-membered N-heterocycles from 2'-NHR--chalcones, 2'-NHR-chalcone dibromides and 2'-NHR-alpha-azidochalcones are described and discussed.
An iridium-catalyzed annulation of chalcones with sulfonylazides via cascade C–H amidation and intramolecular aza-Michael addition was developed, affording a variety of 2-aryl-2,3-dihydro-4-quinolones in moderate to good yields. This reaction features easy operation, readily available starting materials, and the cascade formation of two C–N bonds in one pot.
The first Lewis acid-catalyzed intramolecular interrupted Nazarov cyclization of 1,4-pentadien-3-ols is described.
第一个由Lewis酸催化的1,4-戊二烯-3-醇分子内中断的Nazarov环化反应被描述了。
Brønsted Acid-Catalysed Allylic Amination of 1-(2-Aminoaryl)prop-2-en-1-ols to 1,2-Dihydroquinolines
作者:David Philip Day、Stuart Adam Henry、Yichao Zhao、Jianwen Jin、Guy James Clarkson、Philip Wai Hong Chan
DOI:10.1071/ch18191
日期:——
highly efficient synthetic method to prepare 1,2-dihydroquinolines that relies on trifluoromethanesulfonic acid (TfOH)-catalysed allylicamination of 1-(2-aminoaryl)prop-2-en-1-ols is described. Achieved at a catalyst loading of 0.01 mol-% under mild conditions at room temperature, the reaction was found to be robust, with a wide range of substitution patterns tolerated. The corresponding N-heterocyclic
N-Heterocycles by Cyclization of 2′-Nhr-Chalcones, 2′ -Nhr-Chalcone Dibromides and 2′-Nhr-α-Azidochalcones
作者:A. L. Tökés、Gy. Litkei、L. Szilágyi
DOI:10.1080/00397919208021640
日期:1992.9
Syntheses of six-membered N-heterocycles from 2'-NHR--chalcones, 2'-NHR-chalcone dibromides and 2'-NHR-alpha-azidochalcones are described and discussed.