Ring Expansion of Epoxides under Brønsted Base Catalysis: Formal [3+2] Cycloaddition of β,γ-Epoxy Esters with Imines Providing 2,4,5-Trisubstituted 1,3-Oxazolidines

2015 ◽  
Vol 54 (38) ◽  
pp. 11240-11244 ◽  
Author(s):  
Azusa Kondoh ◽  
Kenta Odaira ◽  
Masahiro Terada
Keyword(s):  
Ring Expansion ◽  
Base Catalysis ◽  
Brønsted Base

Catalytic Enantioselective Synthesis of Tertiary Thiols From 5H-Thiazol-4-ones and Nitroolefins: Bifunctional Ureidopeptide-Based Brønsted Base Catalysis

2013 ◽  
Vol 125 (45) ◽  
pp. 12062-12067 ◽  
Author(s):  
Saioa Diosdado ◽  
Julen Etxabe ◽  
Joseba Izquierdo ◽  
Aitor Landa ◽  
Antonia Mielgo ◽  
...  
Keyword(s):  
Enantioselective Synthesis ◽  
Base Catalysis ◽  
Brønsted Base

scholarly journals Transition State Analysis of Enantioselective Brønsted Base Catalysis by Chiral Cyclopropenimines

2014 ◽  
Vol 136 (30) ◽  
pp. 10700-10707 ◽  
Author(s):  
Jeffrey S. Bandar ◽  
Gregory S. Sauer ◽  
William D. Wulff ◽  
Tristan H. Lambert ◽  
Mathew J. Vetticatt
Keyword(s):  
Transition State ◽  
Base Catalysis ◽  
Brønsted Base ◽  
State Analysis

Insights into highly selective ring expansion of oxaziridines under Lewis base catalysis: a DFT study

2019 ◽  
Vol 6 (5) ◽  
pp. 679-687 ◽  
Author(s):  
Qiao-Chu Zhang ◽  
Xue Li ◽  
Xinghua Wang ◽  
Shi-Jun Li ◽  
Ling-Bo Qu ◽  
...  
Keyword(s):  
Ring Expansion ◽  
Lewis Base ◽  
Base Catalysis ◽  
Dft Study ◽  
Ring Expansion Reaction ◽  
First Time

The possible mechanism and stereoselectivity of the NHC-catalyzed ring expansion reaction of oxaziridines have been theoretically studied for the first time.

Directing the Activation of Donor-Acceptor Cyclopropanes Towards Stereoselective 1,3-Dipolar Cycloaddition Reactions by Brønsted Base Catalysis

2017 ◽  
Vol 56 (39) ◽  
pp. 11831-11835 ◽  
Author(s):  
Jakob Blom ◽  
Andreu Vidal-Albalat ◽  
Julie Jørgensen ◽  
Casper L. Barløse ◽  
Kamilla S. Jessen ◽  
...  
Keyword(s):  
Base Catalysis ◽  
Dipolar Cycloaddition ◽  
Cycloaddition Reactions ◽  
Donor Acceptor ◽  
Brønsted Base

Cluster Preface: Asymmetric Brønsted Base Catalysis

Synlett ◽  
2017 ◽  
Vol 28 (11) ◽  
pp. 1270-1271
Author(s):  
Choon-Hong Tan ◽  
Benjamin List
Keyword(s):  
Asymmetric Catalysis ◽  
Phase Transfer ◽  
Base Catalysis ◽  
General Strategy ◽  
Biological Chemistry ◽  
Max Planck ◽  
Postdoctoral Training ◽  
National University ◽  
Brønsted Base ◽  
The University

Choon-Hong Tan is a professor at the Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore. He received his BSc (Hons) First Class from the National University of Singapore (NUS) and his Phd from the University of Cambridge. He underwent postdoctoral training at the Department of Chemistry and Chemical Biology, Harvard University and the Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School. He began his independent career at the Department of Chemistry, National University of Singapore in 2003. Choon Hong has focused on the development of organocatalytic Brønsted base reactions that can be catalyzed with chiral guanidines. He has also demonstrated that pentanidiums (conjugated guanidiniums) are efficient phase-transfer catalysts. Recently, he described the use of chiral organic cations such as bisguanidiniums to modulate and activate anionic metallic salts. Benjamin List has been a director at the Max-Planck-Institut für Kohlenforschung since 2005. He obtained his Ph.D. in 1997 (Frankfurt). From 1997 until 1998 he conducted postdoctoral research at The Scripps Research Institute in La Jolla (USA) and became an assistant professor there in January 1999. In 2003 he joined the Max-Planck-Institut für Kohlenforschung. He has been an honorary professor at the University of Cologne since 2004. Ben List’s research focuses on organic synthesis and catalysis. He has contributed fundamental concepts to chemical synthesis including aminocatalysis, enamine catalysis, and asymmetric-counteranion-directed catalysis (ACDC). His latest work deals with chiral counteranions in asymmetric catalysis. This remarkably general strategy for asymmetric synthesis has recently found widespread use in organocatalysis, transition-metal catalysis, and Lewis acid catalysis.

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