Conjugated imines and iminium salts as versatile acceptors of nucleophiles
作者:Makoto Shimizu、Iwao Hachiya、Isao Mizota
DOI:10.1039/b814930e
日期:——
development of synthetic methodologies where nucleophilicaddition reactions to imino carbons are utilized in crucial steps. This article summarizes double nucleophilicaddition reactions with alpha,beta-unsaturated aldimines, addition reactions using alkynyl imines, "umpoled" reactions of alpha-imino esters, and the use of iminium salts as reactive electrophiles.
Iminomalonate as a Convenient Electrophilic Amination Reagent for Grignard Reagents
作者:Yasuki Niwa、Kazuki Takayama、Makoto Shimizu
DOI:10.1246/bcsj.75.1819
日期:2002.8
Diethyl 2-[N-(p-methoxyphenyl)imino]malonate underwent amination reactions with alkyl Grignardreagents to give N-aklylation products in good yields. The obtained N-alkylation products were readily converted into N-alkyl-p-anisidines by the oxidative removal of the malonate moiety. The p-methoxyphenyl group was subsequently deprotected to give primary amines.
Synthesis of Indoxylic Acid Esters by Rhodium-catalyzed Carbene N–H Insertion and Thermal Cyclization
作者:Mark A. Honey、Christopher J. Moody
DOI:10.1071/ch14116
日期:——
Reaction between diethyl diazomalonate and a range of N-alkylanilines in the presence of a catalytic amount of rhodium(ii) acetate dimer afforded carbene N–H insertion to produce anilinomalonates in modest-to-good yields. Upon heating to a high temperature for a short time, the anilinomalonates underwent thermal cyclization to indoxylic acid esters.
Diethyl N-anisyliminomalonate has been found to be an excellent electrophilic amination reagent for Grignard reagents to give N-alkylated products in good yields, and subsequent air oxidation affords N-alkylanisidines. (C) 2001 Elsevier Science Ltd. All rights reserved.