Enantioselective α-Amination of 1,3-Dicarbonyl Compounds Using Squaramide Derivatives as Hydrogen Bonding Catalysts
摘要:
Catalytic enantioselective alpha-hydrazination of 1,3-dicarbonyl compounds with azodicarboxylates was investigated in the presence of our newly developed hydrogen bonding catalyst, squaramide 3j. High yields and high enantioselectivities were achieved with low catalyst loading under mild conditions.
Enantioselective α-amination of 1,3-dicarbonyl compounds in batch and flow with immobilized thiourea organocatalysts
作者:Pinar Kasaplar、Erhan Ozkal、Carles Rodríguez-Escrich、Miquel A. Pericàs
DOI:10.1039/c5gc00496a
日期:——
A polymer-supported bifunctional thiourea organocatalyst (PS-TU) has been prepared and successfully used in the enantioselective alpha-amination of 1,3-dicarbonyl compounds with azodicarboxylates. In contrast with homogeneous thioureas, PS-TU is not irreversibly...
The Cu(OTf)2-bipyridine-catalyzed, enantioselective, direct α-amination of β-ketoesters and β-diketones with diethyl azodicarboxylate (DEAD) has been studied. Exceptionally high enantioselectivities of up to 99% ee were found for 1-indanone-based β-ketoesters in particular even for substrates and reagents carrying conventional ester groups such as methyl and ethyl.
C2-symmetric BINOL-squaramide as efficient organocatalyst for the enantioselective α-amination of 1,3-dicarbonyl compounds with dialkyl azodicarboxylates
作者:Shi Tang、Zhi-yong Wang、Bin Liu、Chun-E. Dong
DOI:10.1016/j.cclet.2015.03.033
日期:2015.6
The asymmetric a-amination of 1,3-dicarbonyl compounds with dialkyl azodicarboxylates has been achieved by C-2-symmetric BINOL-squaramide bearing multiple hydrogen bond donors to provide the desired products in excellent yields and enantioselectivities (up to 99% yield and 98% ee). (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.