Direct One‐Pot Reductive N‐Alkylation of Nitroarenes by using Alcohols with Supported Gold Catalysts
作者:Chun‐Hong Tang、Lin He、Yong‐Mei Liu、Yong Cao、He‐Yong He、Kang‐Nian Fan
DOI:10.1002/chem.201100393
日期:2011.6.20
Gold standard support! The directreductive mono‐ or di‐N‐alkylation of aromatic nitro compounds with alcohols, using a hydrogen‐borrowing strategy, was efficiently promoted by a ligand‐free titania‐supportedgoldcatalyst system (see scheme). A variety of nitroarenes were selectively converted into the corresponding secondary or tertiary amines in good to excellent yields without any co‐catalysts
A Highly Active PN<sup>3</sup> Manganese Pincer Complex Performing N-Alkylation of Amines under Mild Conditions
作者:Leonard Homberg、Alexander Roller、Kai C. Hultzsch
DOI:10.1021/acs.orglett.9b00832
日期:2019.5.3
on a nonsymmetric PN3-ligand scaffold for the N-alkylation of amines with alcohols utilizing the borrowing hydrogen methodology is reported. A broad range of anilines and the more challenging aliphatic amines were alkylated with primary and secondary alcohols. Moreover, the combination of low catalyst loadings and mild reaction conditions provides high efficiency for this atom-economic transformation
reaction sequence a primary amine is formed in situ from the corresponding nitro compound. Reversible condensation with aldehydes forms the respective imines, which are finally reduced to the desired secondary amine. This synthesis of secondary amines is atom‐economical and environmentally attractive using cheap and readily available organic compounds as starting materials.
Pyridine mediated transition-metal-free direct alkylation of anilines using alcohols <i>via</i> borrowing hydrogen conditions
作者:Rajagopal Pothikumar、Venugopal T Bhat、Kayambu Namitharan
DOI:10.1039/d0cc05912a
日期:——
azaaromatics as efficient biomimetic hydrogen shuttles for a transition-metal-free direct N-alkylation of aryl and heteroaryl amines using a variety of benzylic and straight chain alcohols. Mechanistic studies including deuteriumlabeling and the isolation of dihydro-intermediates of the benzannulated pyridine confirmed the role of pyridine and a borrowing hydrogen process operating in these reactions