Visible Light Promoted β-C-H Alkylation of β-Ketocarbonyls <i>via</i>
a β-Enaminyl Radical Intermediate
作者:Dehong Wang、Long Zhang、Sanzhong Luo
DOI:10.1002/cjoc.201700785
日期:2018.4
carbonyl activation mode is reported on the basis of photo‐induced single‐electron‐transfer (SET) oxidation of a secondary enamine. The resultant β‐enaminyl radical intermediate was trapped by a wide range of Michael acceptors, producing β‐alkylation products of β‐ketocarbonyls in a highly efficient manner.
Regio- and stereoselective double alkylation of β-enamino esters with organolithium reagents followed by one-pot reduction: convenient method for the synthesis of tertiary γ-amino alcohols
stereoselective procedure for the preparation of tertiary γ-amino alcohols starting from β-enamino esters is presented. In this procedure, the double alkylation of β-enamino esters with organolithium reagents is followed by one-pot reduction with sodium borohydride in methanol/acetic acid. A hypothesis of mechanism is given, explaining the observed diastereoselectivity through molecular modeling. The configuration
提出了一种简单,高产且立体选择性的方法,该方法可从β-烯胺酯开始制备叔γ-氨基醇。在该方法中,用有机锂试剂对β-烯胺酯进行双烷基化,然后用硼氢化钠在甲醇/乙酸中一锅还原。给出了机理的假设,通过分子建模解释了观察到的非对映选择性。产物的构型通过1 H NMR光谱结合构象分析确定。
A Convenient and Effective Method for Synthesizing β‐Amino‐α,β‐Unsaturated Esters and Ketones
作者:Yuanhe Gao、Qihan Zhang、Jiaxi Xu
DOI:10.1081/scc-120028364
日期:2004.12.31
Abstract A convenient and effective method for the preparation of β‐amino‐α,β‐unsaturated esters and ketones has been developed through silica gel‐catalyzed and solvent‐free reactions of β‐dicarbonylic compounds with ammonia and primary amines.
among a range of catalytically relevant enamines. Spin population analysis disclosed that enamine radical cations mainly exhibit the carbon-center free radical feature. Taking experimental and computation data together, a comprehensive picture about the redox property of enamines is presented, which would provide guidance in the development of oxidative enamine catalysis and transformations.
Ketones in the catalytic three-component “one-pot” Kabachnik-Fields synthesis of α-amino phosphonates
作者:E. D. Matveeva、T. A. Podrugina、M. V. Prisyajnoy、N. S. Zefirov
DOI:10.1007/s11172-006-0400-2
日期:2006.7
Reactions of carbocyclic, heterocyclic, and steroidal ketones with benzylamine and diethyl phosphite in a catalytic three-component “one-pot” synthesis of α-amino phosphonates were studied. The activities of mono-and binuclear complexes of tetra(tert-butyl)phthalocyanines as catalysts for this process were compared.