Allylic amination, directly from alcohols, has been demonstrated without any Lewis acid activators using an efficient and regiospecific molecular iron catalyst. Various amines and alcohols were employed and the reaction proceeded through the oxidation/reduction (redox) pathway. A direct one‐step synthesis of common drugs, such as cinnarizine and nafetifine, was exhibited from cinnamyl alcohol that
Asymmetric<i>N</i>-Allylation of Indoles Through the Iridium-Catalyzed Allylic Alkylation/Oxidation of Indolines
作者:Wen-Bo Liu、Xiao Zhang、Li-Xin Dai、Shu-Li You
DOI:10.1002/anie.201200649
日期:2012.5.21
N‐allylindoles by a one‐pot Ir‐catalyzed asymmetric allylicalkylation/oxidation reaction of indolines has been realized. The current method features high regioselectivity and enantioselectivity together with a broad range of indoles with varying electronic properties. The utility of this method was demonstrated by the synthesis of dihydropyrrolo[1,2‐a]indole derivatives.
有两个步骤可能比一个步骤更好:通过一锅Ir催化的二氢吲哚的不对称烯丙基烷基化/氧化反应,可以有效地合成对映体富集的N-烯丙基。目前的方法具有很高的区域选择性和对映选择性,以及范围广泛的具有不同电子特性的吲哚。通过合成二氢吡咯并[1,2- a ]吲哚衍生物证明了该方法的实用性。
Merging of Light/Dark Palladium Catalytic Cycles Enables Multicomponent Tandem Alkyl Heck/Tsuji–Trost Homologative Amination Reaction toward Allylic Amines
light-induced palladium-catalyzed homologative three-component synthesis of allylic amines has been developed. This protocol proceeds via a unique mechanism involving two distinct cycles enabled by the same Pd(0) catalyst: a visible light-induced hybrid radical alkyl Heck reaction between 1,1-dielectrophile and styrene, followed by the “in dark” classical Tsuji–Trost-type allylic substitution reaction. This
Pd(OAc)2/dppf as an efficient and highly active catalyst for the allylation of amines, alcohols and carboxylic acids with 1-phenyl-1-propyne
作者:Yogesh S. Wagh、Dinesh N. Sawant、Pawan J. Tambade、Kishor P. Dhake、Bhalchandra M. Bhanage
DOI:10.1016/j.tet.2011.02.008
日期:2011.4
Pd(OAc)(2)/1,1'-bis(diphenylphosphino)ferrocene as an efficient, highly active catalyst for the allylation of amines, alcohols and carboxylic acids with 1-phenyl-1-propyne has been developed. The effect of various reaction parameters, such as ligand, time, solvent, temperature, metal: ligand ratio and catalyst concentration on yields of the product were investigated. The optimized procedure works well under mild operating conditions and permits rapid generation of a library for various allylated products. (C) 2011 Elsevier Ltd. All rights reserved.
Palladium-Based Hydroamination Catalysts Employing Sterically Demanding 3-Iminophosphines: Branched Kinetic Products by Prevention of Allylamine Isomerization