A new facile approach to N-alkylpyrroles from direct redox reaction of 4-hydroxy-l-proline with aldehydes
作者:ZhiQin Zou、ZeJun Deng、XinHong Yu、ManMan Zhang、SiHan Zhao、Ting Luo、Xin Yin、Hui Xu、Wei Wang
DOI:10.1007/s11426-011-4445-1
日期:2012.1
An unprecedented acetic acid-catalyzed efficient access to N-alkylpyrroles from reaction of 4-hydroxy-l-proline with a variety of aldehydes has been achieved in good to excellent yields under mild reaction conditions.
Amines are prominent in natural products, pharmaceutical agents and agrochemicals. Moreover, they are synthetically valuable building blocks for the construction of complex organic molecules and functional materials. However, amines, especially aliphatic and aromaticamines with free N–H bonds, tend to coordinate with transition metals and deactivate the catalyst, posing a tremendous challenge to applying
Formation of <i>N</i>-Alkylpyrroles via Intermolecular Redox Amination
作者:Nirmal K. Pahadi、Miranda Paley、Ranjan Jana、Shelli R. Waetzig、Jon A. Tunge
DOI:10.1021/ja907357g
日期:2009.11.25
A wide variety of aldehydes, ketones, and lactols undergo redox amination when allowed to react with 3-pyrroline in the presence of a mild Bronsted acid catalyst. This reaction utilizes the inherent reducing power of 3-pyrroline to perform the equivalent of a reductive amination to form alkyl pyrroles. In doing so, the reaction avoids stoichiometric reducing agents that are typically associated with reductive aminations. Moreover, the redox amination protocol allows access to alkyl. pyrroles that cannot be made via standard reductive amination.
Synthesis of N-alkyl pyrroles via decarboxylation/dehydration in neutral ionic liquid under catalyst-free conditions
作者:Veena D. Yadav、Shashikant U. Dighe、Sanjay Batra
DOI:10.1039/c4ra09797a
日期:——
A catalyst-free benign route toN-alkyl pyrroles by reacting aromatic, heteroaromatic or aliphatic aldehydes with 4-hydroxyproline in neutral ionic liquid under microwave irradiation is presented.