A general, enantioselective synthesis of N-alkyl terminal aziridines and C2-functionalized azetidines via organocatalysis
摘要:
A short, high-yielding protocol involving the enantioselective alpha-chlorination of aldehydes has been developed for the enantioselective synthesis of C2-functionalized aziridines and N-alkyl terminal azetidines from a common intermediate. This methodology allows for the rapid preparation of functionalized aziridines in 50-73% overall yields and 88-94% ee, and azetidines in 22-32% overall yields and 84-92% ee. Moreover, we developed a scalable and cost-effective route to the key organocatalyst (54% overall yield, >95% dr). (C) 2015 Elsevier Ltd. All rights reserved.
A general, enantioselective synthesis of 2-substituted thiomorpholines and thiomorpholine 1,1-dioxides
作者:Carson W. Reed、Craig W. Lindsley
DOI:10.1016/j.tetlet.2019.151104
日期:2019.10
In the course of our drug discovery programs, we had need to access chiral, 2-substituted thiomorpholines and their oxidized congeners, thiomorpholine 1,1-dioxides. Here, we disclose a high-yielding, general protocol for the enantioselective synthesis of C2-functionalized thiomorpholines and thiomorpholine 1,1-dioxides.
DyKAT by DiCat: Stereoconvergent Dienamine-Catalyzed Claisen Rearrangements
作者:Ana De Oliveira Silva、Jordan L. Harper、Katherine N. Fuhr、Roger A. Lalancette、Paul Ha-Yeon Cheong、Stacey E. Brenner-Moyer
DOI:10.1021/acs.joc.2c01079
日期:2022.8.5
This Claisenrearrangement establishes the feasibility of DyKAT of γ-epimeric enals via dienamine formation to afford enantioenriched products. γ-Aryl and -alkyl enals, and exocyclic enals that introduce quaternary centers, are all amenable substrates. Products are readily converted into pyrrolidines or cyclopentenols. Notably, a reactive dienamine intermediate has been isolated from a catalytic reaction
A simple enantioselective preparation of (2S,5S)-2,5-diphenylpyrrolidine and related diaryl amines
作者:David J Aldous、William M Dutton、Patrick G Steel
DOI:10.1016/s0957-4166(00)00208-1
日期:2000.6
A short efficient catalytic asymmetric route to the preparation of C-2-symmetric diaryl cyclic amines is described. (C) 2000 Elsevier Science Ltd. All rights reserved.
Mukaiyama–Michael Reactions with Acrolein and Methacrolein: A Catalytic Enantioselective Synthesis of the C17–C28 Fragment of Pectenotoxins
作者:Eeva K. Kemppainen、Gokarneswar Sahoo、Arto Valkonen、Petri M. Pihko
DOI:10.1021/ol203486p
日期:2012.2.17
Enantioselective iminium-catalyzed reactions with acrolein and methacrolein are rare. A catalytic enantioselective Mukaiyama-Michael reaction that readily accepts acrolein or methacrolein as substrates, affording the products in good yields and 91-97% ee, is presented. As an application of the methodology, an enantioselective route to the key C17-C28 segment of the pectenotoxin using the Mukaiyama-Michael reaction as the key step is described.