developed for one-pot, five-component synthesis of highlyfunctionalized piperidines from reactions of β-keto esters, aromatic aldehydes, and various amines catalyzed in acetic acid medium. The reaction proceeded smoothly to generate the corresponding product in good yield. We have found that the use of acetic acid as reaction medium has a remarkable beneficial effect on the reaction, allowing it to
Trityl chloride as an efficient organic catalyst for one-pot, five-component and diastereoselective synthesis of highly substituted piperidines
作者:Seyed Sajad Sajadikhah、Nourallah Hazeri、Malek Taher Maghsoodlou、Sayyed Mostafa Habibi-Khorassani、Anthony C. Willis
DOI:10.1007/s11164-012-0997-8
日期:2014.2
chloride is used as an efficient organic catalyst for the one-pot, five-component and diastereoselective synthesis of highly substituted piperidines by means of reaction between aromatic aldehydes, amines and β -ketoesters in methanol at 50 °C. The structure as well as relative stereochemistry of products was confirmed by single X-ray crystallographic analysis. This homogeneous catalyst procedure includes
1-Methyl-2-oxopyrrolidinium hydrogen sulfate ([Hpyro][HSO4]) is used as an ionic liquid catalyst for the one-potthree-componentsynthesis of highly substituted piperidines from aromatic aldehydes, anilines and β–ketoesters in refluxing ethanol. This homogeneous catalyst procedure has the advantages of easy work-up, no need for column chromatography, simple and readily available precursors, and good
alternative approach for not only highlysubstitutedtetrahydropyridines (THPs) but also fully substitutedtetrahydropyridines (FTHPs) in moderate to good yields. The plausible mechanism for the formation of THPs was greatly promoted by the H+ ion coming from acetic acid. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following