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.
I2-Induced Stereospecific Synthesis of 4-Piperidones through Double Mannich Reaction and Tandem Cyclization
作者:Xiao-Dong Jia、Xiang-Ning Chen、Xiao-E Wang、Cong-De Huo、Wen-Juan Wang、Yan Ren、Xi-Cun Wang
DOI:10.1002/ejoc.201001607
日期:2011.3
An I 2 -induced doubleMannichreaction and tandem cyclization of imines and ketones was investigated for the synthesis of a series of 1,2,6-triaryl-4-piperidones. During the process of cyclization, only one product was produced out of four possible 4-piperidones. Two pathways involving the balance between chelation effects and hydrogen bonding were proposed to rationalize the formation of the products
研究了 I 2 诱导的双曼尼希反应和亚胺和酮的串联环化,以合成一系列 1,2,6-三芳基-4-哌啶酮。在环化过程中,四种可能的4-哌啶酮中仅产生一种产物。提出了两种涉及螯合效应和氢键之间平衡的途径来合理化产物的形成,这得到了对 β-氨基酮和亚胺之间反应的进一步研究的支持。
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