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.
Abstract A highlyefficientone-pot, three-component synthesis of β-aminoketones was demonstrated using the cost-effective, noncorrosive, and easily available Fe(O2CCF3)3 as a catalyst for the first time. The method can be employed to synthesize a wide range of target compounds and to introduce different functional groups into the β-aminoketone skeleton. Additionally, the method consistently has the
A novel Mannich-type reaction in aqueous media. Lanthanide triflate-catalysed condensation of aldehydes, amines and vinyl ethers for the synthesis of β-amino ketones
作者:Shū Kobayashi、Haruro Ishitani
DOI:10.1039/c39950001379
日期:——
A novel Mannich-type reaction between an aldehyde, an amine and a vinyl ether is catalysed by lanthanide triflates to afford a β-amino ketone in good yield in aqueous media.
Stereoselective Synthesis of β-Amino Ketones via Direct Mannich-Type Reactions, Catalyzed with ZrOCl2·8H2O under Solvent-Free Conditions
作者:Bagher Eftekhari-Sis、Amir Abdollahifar、Mohammed M. Hashemi、Maryam Zirak
DOI:10.1002/ejoc.200600493
日期:2006.11
zirconium oxychloride (ZrOCl2·8H2O) efficiently catalyzes the directMannich-typereaction of a variety of in situ generated aldimines using aldehydes and anilines with ketones in a three-componentreaction under solvent-free conditions. The reaction proceeds rapidly and affords the corresponding β-aminoketones in good to high yields with good to excellent stereoselectivities. The catalyst can be recycled
afforded corresponding Mannich adducts. In the case of cyclohexanone, stereoselectivity was changed depending on the nature of the substitution on benzaldehydes, in which, moderate electron-donating and electron-withdrawing groups afforded the anti isomer as major products, but strongly electron-donating substituted benzaldehydes led to syn isomer as the major Mannich adducts. Mannich reaction with cycloheptanone