[EN] CYCLOPROPENIMINE CATALYST COMPOSITIONS AND PROCESSES<br/>[FR] COMPOSITIONS CATALYTIQUES À BASE DE CYCLOPROPÉNIMINE ET PROCÉDÉS
申请人:UNIV COLUMBIA
公开号:WO2013059118A1
公开(公告)日:2013-04-25
The present invention provides, inter alia, a cyclopropenimine Brønsted base catalyst and a cyclopropenimine scaffold for use as a Brønsted base catalyst. This cyclopropenimine has the structure (100). Methods for making such a cyclopropenimine are also provided. Further provided are processes for carrying out an organic synthetic reaction and processes for catalyzing a proton transfer reaction enantioselectively using such a cyclopropenimine Brønsted base catalyst.
Enantioselective solution- and solid-phase synthesis of glutamic acid derivatives via Michael addition reactions
作者:Martin J. O'Donnell、Francisca Delgado、Esteban Domı́nguez、Jesús de Blas、William L. Scott
DOI:10.1016/s0957-4166(01)00116-1
日期:2001.4
base ester derivatives to Michael acceptors either in solution (56–89% e.e.) or on solid-phase (34–82% e.e.) gave optically active unnatural α-amino acid derivatives. The reaction was conducted in the presence of chiral, non-racemic quaternary salts derived from the cinchonaalkaloids using neutral, non-ionic phosphazene bases.
Structure–activity relationship studies of cyclopropenimines as enantioselective Brønsted base catalysts
作者:Jeffrey S. Bandar、Alexandre Barthelme、Alon Y. Mazori、Tristan H. Lambert
DOI:10.1039/c4sc02402h
日期:——
New insights aid in the understanding and design of cyclopropenimine-based asymmetric catalysts.
新的见解有助于理解和设计基于环丙烯亚胺的不对称催化剂。
Expanding the Toolbox of Heterogeneous Asymmetric Organocatalysts: Bifunctional Cyclopropenimine Superbases for Enantioselective Catalysis in Batch and Continuous Flow
作者:Costanza Leonardi、Arianna Brandolese、Lorenzo Preti、Olga Bortolini、Eleonora Polo、Paolo Dambruoso、Daniele Ragno、Graziano Di Carmine、Alessandro Massi
DOI:10.1002/adsc.202100757
日期:2021.12.21
A strategy for the immobilization of chiral 2,3-bisaminocyclopropenium salt (pre-catalyst) onto polystyrene and silica supports is presented together with a suitable procedure for the conversion into the corresponding cyclopropenimine superbase catalysts. The activity and recyclability of polystyrene- and silica-supported cyclopropenimines were initially tested under batch conditions in a model Michael
将手性 2,3-双氨基环丙烯盐(预催化剂)固定在聚苯乙烯和二氧化硅载体上的策略以及用于转化为相应环丙烯亚胺超强碱催化剂的合适程序。聚苯乙烯和二氧化硅负载的环丙烯亚胺的活性和可回收性最初是在分批条件下在迈克尔加成模型中测试的,检测出可比较的效率,但后者多相催化剂具有优异的稳定性(5 个循环,累积 TON 为 27.1)。在甘氨酸亚胺与不同迈克尔受体的反应中,优选的二氧化硅负载的环丙烯亚胺的表现与可溶性对应物非常相似(48-92% 产率;60-98% ee),它可以用作制造固定床中反应器(耐压不锈钢柱)的填充材料。连续流实验具有令人满意的长期稳定性(运行 24 小时),转换效率和对映选择性不变。
Chiral Octahedral Complexes of Cobalt(III) as “Organic Catalysts in Disguise” for the Asymmetric Addition of a Glycine Schiff Base Ester to Activated Olefins
作者:Victor I. Maleev、Michael North、Vladimir A. Larionov、Ivan V. Fedyanin、Tatyana F. Savel'yeva、Margarita A. Moscalenko、Alexander F. Smolyakov、Yuri N. Belokon
DOI:10.1002/adsc.201400091
日期:2014.5.26
complexes of cobalt(III) prepared from Schiff bases derived from chiral diamines and salicylaldehydes were shown to be efficient catalysts of the benchmark asymmetric phase‐transfer Michael addition of nine activated olefins to O’Donnell’s substrate. The reaction products had enantiomeric purities of up to 96%. DFT calculations were invoked to rationalize the stereochemistry of the addition.