A tandem reaction of heterocyclic ketene aminals and 1,2-diaza-1,3-dienes was developed for the expedient synthesis of pyrimidopyrrolopyridazine derivatives. This process involved an intramolecular conjugate addition followed by CuCl2-catalyzed hydrazone formation.
Direct Access to α-Oxoketene Aminals via Copper-Catalyzed Formal Oxyaminalization of Alkenes under Mild Conditions
作者:Lu Wang、Chaorong Qi、Tianzuo Guo、Huanfeng Jiang
DOI:10.1021/acs.orglett.9b00518
日期:2019.4.5
A copper-catalyzed four-component formal oxyaminalization of alkenes with Togni’s reagent and amines using molecular oxygen as both the oxidant and oxygen source has been developed for the first time, offering a straightforward and efficient method for the synthesis of a range of structurally diverse α-oxoketene aminals. The use of cheap copper catalyst and readily available substrates, excellent functional
A facile synthesis of tetrahydroimidazo[1,2-a]pyridines and tetrahydrobenzo[b]imidazo[1,2,3-ij][1,8]naphthyridines through NHC-catalyzed cascade annulations
A new efficient approach for the synthesis of tetrahydroimidazo[1,2-a]pyridines and tetrahydrobenzo[b]imidazo[1,2,3-ij][1,8]naphthyridines with biological significance was successfully developed through a NHC-catalyzed cascade C–C bond and C–N bond formation process. This new alternative approach for the assembly of these multi-functionalized nitrogen bridgehead-fused heterocycles features mild conditions
通过NHC催化的级联反应成功开发了一种新的高效合成四氢咪唑并[1,2- a ]吡啶和四氢苯并[ b ]咪唑并[1,2,3- ij ] [1,8]萘啶的新方法C–C键和C–N键的形成过程。组装这些多功能氮桥头稠合杂环的这种新的替代方法具有温和的条件,中等至高收率和操作简便性。
Environmentally friendly approach to convergent synthesis of highly functionalized indanone fused multicyclic pyrrolines
作者:Xi-Min Liu、Xin-Rong Lin、Sheng-Jiao Yan、Mei-Yang Peng、Rong Huang、Jun Lin
DOI:10.1016/j.tet.2016.07.006
日期:2016.9
A facile synthesis of highly functionized indanone fused multicyclic pyrrolines using the heterocyclic ketene aminal and ninhydrin is described. Derivative alkoxyl or amine substituted analogues were also directly achieved upon adding alcohols or amines as corresponding starting materials. The reaction conditions are environment friendly and have a good tolerance towards a variety of heterocyclic ketene