Synthesis of β-Aminoketones and Construction of Highly Substituted 4-Piperidones by Mannich Reaction Induced by Persistent Radical Cation Salts
作者:Xiao-Dong Jia、Xiao-E Wang、Cai-Xia Yang、Cong-De Huo、Wen-Juan Wang、Yan Ren、Xi-Cun Wang
DOI:10.1021/ol9027978
日期:2010.2.19
A Mannich reaction of imines and ketones induced by persistent radical cation salts was investigated, and a series of Mannich bases, β-aminoketones, were synthesized. A novel cyclization to form the 4-piperidone skeleton was achieved in a tandem process. The reaction can be rationalized as a radical cation process supported by various evidence.
Double Mannich Reaction and Tandem Cyclization of Imines with Ketones Catalyzed by Indium(III) Chloride Tetrahydrate: Stereoselective Synthesis of Highly Substituted 4-Piperidones
作者:Xiao-Dong Jia、Wen-Juan Wang、Cong-De Huo、Yan Ren、Xiang-Ning Chen、Xiao-Lan Xu、Xi-Cun Wang
DOI:10.1002/adsc.201000760
日期:2011.2.11
A double Mannich reaction followed by tandem cyclization of imines and ketones catalyzed by indium(III) chloride tetrahydrate (InCl3⋅4 H2O) was investigated, and a series of 1,2,6-triaryl-4-piperidones was synthesized in a stereoselective way. In this reaction, aromatic imines substituted by electron-withdrawing groups exhibited high reactivity toward the cyclization to 4-piperidones. A variety of