Protecting-Group-Directed Diastereoselective Synthesis of Substituted Tetrahydropyrroloquinolines
作者:Tohasib Yusub Chaudhari、N. Arjunreddy Mallampudi、Deepak Bansal、Debendra K. Mohapatra、Vibha Tandon
DOI:10.1002/ejoc.202000348
日期:2020.5.14
A novel synthetic method for chiral tricyclic tetrahydropyrroloquinolines following a protecting‐group‐directed domino reaction consisting of Michael addition and Mannich cyclization under mild reaction conditions was developed.
An efficient, copper-catalyzed [3+1+1] cycloaddition reaction was developed for the expedient synthesis of pharmacologically interesting polysubstituted pyrroles from easily available nitrones and α-acidic isocyanides. The given approach features a new mode of cycloaddition between nitrones and isocyanides with wide substrate scope, good functional group tolerance, and operational simplicity. The operando
A strategy has been developed for the regiospecificsynthesis of 1‐trifluoromethylisoquinoline derivatives. This strategy is enabled by a photoredoxvinylisocyanideinsertion with the help of Umemoto’s reagent. The methodology presented here provides an access to highly fuctionalized 1‐trifluoromethylisoquinolines regiospecifically under mild conditions in good‐to‐excellent chemical yields. A detailed
Tandem radical cyclization for the construction of 1-difluoroalkylated isoquinolines <i>via</i> Cu catalyzed and visible light-promoted pathways
作者:Fangwei Ding、Yanqiu Jiang、Kaifeng Lin、Lei Shi
DOI:10.1039/c8ob00232k
日期:——
A Cu/B2pin2 system promoted cyclization for the synthesis of 1-difluoroalkylated isoquinolines with vinyl isocyanides and bromodifluoroacetic derivatives in moderate to good yields was reported. This method provided a mild and efficient pathway for the construction of diverse 1-difluoroalkylated isoquinolinesvia a proposed tandem radical cyclization process.
据报道,Cu / B 2 pin 2系统促进了环化反应,以中等至良好的产率合成了带有乙烯基异氰酸酯和溴代二氟乙酸衍生物的1-二氟烷基化异喹啉。该方法通过提议的串联自由基环化过程为构建各种1-二氟烷基化异喹啉提供了温和而有效的途径。
Microwave-assisted synthesis of hydroxyl-containing isoquinolines by metal-free radical cyclization of vinyl isocyanides with alcohols
hydroxyl-containing isoquinolines from a metal-free radical cyclization reaction of vinyl isonitriles with alcohols was developed with moderate-to-excellent yields. Vinyl isonitriles are coupled with alkyl radicals through direct catalytic functionalization of the α sp3 C–H bond of alcohols. The methodology demonstrates a broad substrate scope, shows excellent functional group tolerance, is highly atom-economical