Synthesis of Diversely Substituted Imidazolidines
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[3+2] Cycloaddition of 1,3,5‐Triazinanes with Donor‐Acceptor Aziridines and Their Anti‐Tumor Activity
cycloaddition of 1,3,5-triazinanes with donor-acceptor aziridines has been developed, accessing diverselysubstituted imidazolidines high efficiency. Mechanistic investigations support the formation of imidazolidines through an SN1-like pathway. Furthermore, these imidazolidines exhibit promising anti-tumor activity against a series of human cancer cell lines.
已经开发了AY(OTf)3催化的供体-受体氮丙啶与1,3,5-三嗪并[3 + 2]环加成反应,可高效获得各种取代的咪唑烷。机理研究支持通过S N 1样途径形成咪唑烷。此外,这些咪唑烷类化合物显示出对一系列人类癌细胞系的有希望的抗肿瘤活性。
Catalytic Asymmetric Hydroacyloxylation/Ring-Opening Reaction of Ynamides, Acids, and Aziridines
A highlyenantioselective three-component reaction of ynamides with carboxylic acids and 2,2′-diester aziridines has been realized by using a chiralN,N′-dioxide/Ho(OTf)3 complex as a Lewis acid catalyst. The process includes the formation of an α-acyloxyenamide intermediate through the addition of carboxylic acids to ynamides and the following enantioselective nucleophilic addition to in-situ-generated
The enantioselective [3 + 1]-cycloaddition of racemic donor–acceptor (D–A) aziridines with isocyanides was first realized under mild reaction conditions using a chiral N,N′-dioxide/MgII complex as catalyst, providing a facile route to enantioenriched exo-imido azetidines with good to excellent yield (up to 99%) and enantioselectivity (up to 94% ee). An obvious chiral amplification effect was observed
An Approach to α‐ and β‐Amino Peroxides via Lewis Acid Catalyzed Ring Opening‐Peroxidation of Donor‐Acceptor Aziridines and
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‐Activated Aziridines
作者:Kuldeep Singh、Pramod Kumar、Chenna Jagadeesh、Manveer Patel、Dinabandhu Das、Jaideep Saha
DOI:10.1002/adsc.202000815
日期:2020.10.6
Site‐selective ring‐opening process of two different aziridine classes with hydroperoxide is described herein that provides access to various α‐ and β‐amino and α‐(imino)‐peroxy compounds. This strain‐release‐driven peroxide addition to aziridines represents an alternative approach for entries to biologically significant heteroatom substituted organic peroxides and complements existing methods in the
An enantioselective [3+2] annulation of donor-acceptor aziridines with aldehydes has been realized using Nd(OTf)3/N,N[prime or minute]-dioxide/LiNTf2 catalyst system, providing various chiral cis-1,3-oxazolidines in moderate to good yields with high level of stereocontrol....