Dual Organocatalytic Ion-Pair Assemblies: A Highly Efficient Approach for the Enantioselective Oxa-Michael-Mannich Reaction of Salicylic Aldehydes with Cyclohexenones
Better in pairs: A highlyefficient asymmetric reaction of salicylicaldehydes with cyclohexenones by means of a domino oxa‐Michael–Mannich pathway has been achieved by using novel dualorganocatalytic ion‐pair assemblies from pyrrolidines and readily available primary amino acids (see scheme).
A Diels–Alder reaction conducted within the parameters of aqueous organocatalysis: still just smoke and mirrors
作者:G. Neil Stowe、Kim D. Janda
DOI:10.1016/j.tetlet.2010.10.134
日期:2011.4
Conducting reactions using water as solvent is a highly prized goal for the organic chemist. Based upon recent literature and our continuing interest in the field of aqueous organocatalysis, we tested the scope of an enamine based Diels-Alder reaction using (+/-)-nornicotine, proline, and a proline derivative as aqueous organocatalysts. Unfortunately, none of the examined catalysts under aqueous conditions proved useful, leaving the aqueous Diels-Alder reaction as an elusive goal. (C) 2010 Elsevier Ltd. All rights reserved.