Dicationic Electrophiles from Olefinic Amines in Superacid
作者:Yun Zhang、Aaron McElrea、Gregorio V. Sanchez、Dat Do、Alma Gomez、Sharon L. Aguirre、Rendy、Douglas A. Klumpp
DOI:10.1021/jo030024z
日期:2003.6.1
This paper describes the superacid-catalyzed chemistry of olefinic amines and related compounds. A variety of olefinic amines are found to react with benzene in CF3SO3H (triflic acid) to give addition products in good yields (75-99%), including the pharmaceutical agents fenpiprane and prozapine. A general mechanism is proposed that invokes the formation of reactive, dicationic electrophiles and the direct observation of a diprotonated species is reported from low-temperature NMR experiments. This chemistry is also used to conveniently prepare functionalized polystyrene beads having pendant amine groups.
Tertiary amine synthesis via reductive coupling of amides with Grignard reagents
作者:Lan-Gui Xie、Darren J. Dixon
DOI:10.1039/c7sc03613b
日期:——
reductive coupling reaction of Grignard reagents and tertiary amides affording functionalised tertiary amine products via an efficient and technically-simple one-pot, two-stage experimental protocol, is reported. The reaction – which can be carried out on gram-scale using as little as 1 mol% Vaska's complex [IrCl(CO)(PPh3)2] and TMDS as the terminal reductant for the initial reductive activation step –
Iridium-catalysed reductive allylic amination of α,β-unsaturated aldehydes
作者:Liang Liu、Renshi Luo、Jinghui Tong、Jianhua Liao
DOI:10.1039/d3ob01753b
日期:——
unsaturated hydrocarbons have been considered for allylic amination reactions to minimize waste production. Herein, we present an iridium-catalysed method for reductive allylic amination of α,β-unsaturatedaldehydes with amines to afford N-allylic amines under air conditions. This protocol is demonstrated to provide products from many substrates (41 examples) in moderate-to-excellent yields. This synthetic