α,β-Dehydrogenation of esters with free O H and N H functionalities via allyl-palladium catalysis
摘要:
A direct and selective method for the alpha,beta-dehydrogenation of esters using palladium catalysis in the presence of free O-H and N-H functionalities is reported herein. Allyl-palladium catalysis allows for preservation of readily oxidizable functionalities such as amines and alcohols. Furthermore, an economical protocol using LDA was developed for the dehydrogenation of beta-amino esters. (C) 2018 Elsevier Ltd. All rights reserved.
Elimination–addition. Part VIII. Structures of acetylene–amine adducts
作者:C. H. McMullen、C. J. M. Stirling
DOI:10.1039/j29660001217
日期:——
secondary amines to acetylenes activated by the groups PhCO–, PhCH2N(Me)·CO–, MeO·CO–, PhCH2·SO–, and PhCH2·SO2– has been investigated. In all cases, 1 : 1-adducts are formed and these have the enamine structure.
An unusual Michael addition–dealkylation or elimination via the reaction of tertiary or secondary amines with a (Z)-iodoacrylate
作者:Graham Maw、Carl Thirsk、Andrew Whiting
DOI:10.1016/s0040-4039(01)01806-8
日期:2001.11
A series of (E)-ammonium or amino acrylates have been prepared via the Michael addition of methyl (Z)-iodoacrylate and several secondary and tertiary alkylamines. Tertiary amines undergo concomitant addition-dealkylation, almost quantitatively producing (E)-dialkylamino acrylates. (C) 2001 Elsevier Science Ltd. All rights reserved.
Lewis Acid-Catalyzed [3+2] Cycloaddition of Donor-Acceptor Cyclopropanes and Enamines: Enantioselective Synthesis of Nitrogen-Functionalized Cyclopentane Derivatives
作者:Kamal Verma、Prabal Banerjee
DOI:10.1002/adsc.201600221
日期:2016.6.30
efficient method for the synthesis of nitrogen‐functionalized cyclopentane derivatives via [3+2] cycloaddition of enamines with donor‐acceptor cyclopropanes in the presence of catalytic amounts of various Lewisacids at room temperature has been developed; furthermore, the corresponding β‐amino acid was synthesized by monodecarboxylation and hydrogenolysis. An enantioenriched synthesis of nitrogen‐functionalized
α,β-Dehydrogenation of esters with free O H and N H functionalities via allyl-palladium catalysis
作者:Suzanne M. Szewczyk、Yizhou Zhao、Holt A. Sakai、Pascal Dube、Timothy R. Newhouse
DOI:10.1016/j.tet.2018.02.028
日期:2018.6
A direct and selective method for the alpha,beta-dehydrogenation of esters using palladium catalysis in the presence of free O-H and N-H functionalities is reported herein. Allyl-palladium catalysis allows for preservation of readily oxidizable functionalities such as amines and alcohols. Furthermore, an economical protocol using LDA was developed for the dehydrogenation of beta-amino esters. (C) 2018 Elsevier Ltd. All rights reserved.