2 edition of Synthetic applications of functionalized aziridines found in the catalog.
Synthetic applications of functionalized aziridines
Gang Greg Chen
Written in English
|Contributions||University of Toronto. Dept. of Chemistry.|
|The Physical Object|
|Pagination||xiv, 257 leaves :|
|Number of Pages||257|
The introduction of amines onto functionalized aromatics at specific and pre-determined positions (ortho versus meta versus para) is currently achievable only in transition-metal-catalysed. short synthesis of alkyl 2-(bromomethyl)aziridinecarboxylates and alkyl 3-bromoazetidinecarboxylates was developed involving amination, bromination, and base-induced cyclization of alkyl 2-(bromomethyl)acrylates. The aziridines are the kinetically favored cyclization products and could be transformed into 3-bromoazetidinecarboxylic acid derivatives via thermal isomerization.
Aziridine is an organic compound consisting of the three-membered heterocycle (CH 2) 2 NH. It is a colorless, toxic, volatile liquid that is of significant practical interest. Its derivatives, also referred to as aziridines, are of broader interest in medicinal chemistry. Arkivoc , i, Singh, G. S. et al. Page 52 ©ARKAT USA, Inc aziridines has been exploited by synthetic organic chemists for developing synthetic protocols to several novel heterocyclic compounds either directly or through the formation of diverse 1,2-difunctionalized compounds.
introduction of functionalized chains on the heterocycle. N R2 R1 M R3 + E⊕ N R2 R1 E R3 − M⊕ M = Li, Mg, Zn, Zr Asymmetric Aziridination via Cyclization Methods General approaches to the asymmetric synthesis of aziridines through cyclization methods can be divided into two main categories: (A) nitrogen nucleophilic. Synthetic application of chiral aziridines 3 rd International Conference on Organic and Inorganic Chemistry July , Chicago, USA. Hyun-Joon Ha. Hankuk University of Foreign Studies, South Korea. Keynote: Organic Chem Curr Res. Abstract.
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Aziridines continue to find widespread application in strategies for the synthesis of nitrogen-containing heterocycles. The Wang group has reported the asymmetric Synthetic applications of functionalized aziridines book of hexahydropyrrolo[2,3- b ]indoles by means of a [3 + 2] cycloaddition of 3-nitroindoles with vinyl aziridines (18JOC).
A short, high-yielding protocol involving the enantioselective α-chlorination of aldehydes has been developed for the enantioselective synthesis of C2-functionalized aziridines and N-alkyl terminal azetidines from a common methodology allows for the rapid preparation of functionalized aziridines in 50–73% overall yields and 88–94% ee, and azetidines in 22–32% overall Cited by: In book: Aziridines and Epoxides in Organic Synthesis, pp - The synthesis of functionalized aziridines based on the lithiation/trapping sequence of readily available parent aziridines.
The addition of diazoacetoacetates to aromatic imines derived from p-methoxyaniline is achieved using dirhodium tetraacetate as the functionalized aziridines are obtained in good yield and with excellent stereoselectivity. 2-Diazo-1,3-diketones also provide good yields of aziridines, but dimethyl diazomalonate is inactive in the transformation.
Aziridines and epoxides are among the most widely used intermediates in organic synthesis, acting as precursors to complex molecules due to the strains incorporated in their skeletons. Besides their importance as reactive intermediates, many biologically active compounds also contain these three-membered rings.
Filling a gap in the literature, this clearly structured book presents the much. Divergent synthesis of functionalized pyrrolidines and γ-amino ketones via rhodium-catalyzed switchable reactions of vinyl aziridines and silyl enol ethers.
Chemical Communications54 (19), DOI: /C8CCG. By using the Suzuki-Miyaura protocol, a simple straightforward synthesis of functionalized 2-arylaziridines has been developed. By means of this synthetic strategy from readily available ortho- meta- and para-bromophenylaziridines and aryl- or heteroarylboronic acids, new aziridines could be obtained.
The cross-coupling reactions occurred without ring opening of the three membered ring. While the synthetic applications of aziridines have received much attention there is little precedent of their opening with weak nucleophiles such as carboxylate anions.
However, we expected that the presence of the 2-methoxy substituent would facilitate the desired transformation. A short, high-yielding protocol involving the enantioselective α-chlorination of aldehydes has been developed for the enantioselective synthesis of C2-functionalized aziridines and N-alkyl.
Aziridines also have an important role in the preparation of further types of nitrogen-containing compounds . As a consequence, the preparation of aziridines is of great impor-tance .
The primary synthetic approaches involve either the direct aziridination of an olefin  or the reaction of an imine with diazoalkanes.
Synthetic Communications42 (6), DOI: / Kyu Myung Lee, Jong Chan Kim, Philjun Kang, Won Koo Lee, Heesung Eum, Hyun-Joon Ha. Chiral aziridinecarboxylates: versatile precursors for functionalized tetrahydroisoquinoline (THIQ).
The Co 2 (CO) 8-catalyzed carbonylation of different classes of non-activated aziridines with diverse substitution patterns was l attention was devoted to selectivity issues and reaction optimization.
This study resulted in the regio- and stereospecific synthesis of 24 novel β-lactam target structures in high yields on a multigram scale. While the synthetic applications of aziridines have received much attention We have developed an efficient, mechanistically novel entry into polysubstituted, functionalized aziridines.
Our method is based on a sequential three-component reaction initiated by bromomethoxylation of the exocyclic double bond in readily available 3. Aziridines are organic compounds containing the aziridine functional group, a three-membered heterocycle with one amine (-NR-) and two methylene bridges (-CR 2-).
The parent compound is aziridine (or ethylene imine), with molecular formula C 2 H 4 l drugs feature aziridine rings, including mitomycin C, porfiromycin, and azinomycin B (carzinophilin). The renowned editor has succeeded in gathering together excellent authors to cover synthesis, applications, and the biological aspects in equal depth.
Divided roughly equally between aziridines and epoxides, the twelve chapters discuss: * Synthesis of aziridines * Nucleophilic ring-opening of aziridines and epoxides. Aziridines have attracted considerable attention as starting materials in numerous applications, and many papers and review articles dealing with the synthesis of aziridines as well as their use in synthetic applications have been published since In ring-opening reactions, it.
Single-nitrogen containing saturated cyclic amines are an important part of both natural and synthetic bioactive compounds. A number of methodologies have been developed for the synthesis of aziridines, azetidines, pyrrolidines, piperidines, azepanes and azocanes.
This review highlights some facile and green synthetic routes for the synthesis of unsubstituted, multisubstituted and highly.
The Synthesis and Applications of N-Alkenyl Aziridines Nicholas A. Afagh Master of Science Department of Chemistry University of Toronto Abstract N-alkenyl aziridines are a unique class of molecules that do not behave as typical enamines as a result of the inability of the nitrogen atom lone-pair of electrons to delocalize.
The attenuated. Challenges and Solutions for Organic Synthesis isbn Paul Knochel (ed.) Handbook of Functionalized Organometallics Applications in Synthesis isbn Martin Hiersemann, Udo Nubbemeyer (eds.) The Claisen Rearrangement Methods and Applications isbn Francois Diederich, Peter J.
Stang, and Rik R. The tertiary amine DABCO catalyzes the reaction of imines with phenacyl bromide derivatives to afford functionalized aziridines in high yields and stereoselectivities in a one-pot process - including the formation of ylides and their precursors.
Yadav, R. Kapoor, Garima, Synlett. X. Li, N. Chen, J. Xu, Synthesis,Two alternative and complementary one-pot procedures for the direct transformation of 2-amino alcohols to N-tosyl aziridines are presented.
Less hindered aziridines can be obtained in high yields by tosylation and in situ cyclization effected by potassium hydroxide in water/dichloromethane.9 AZIRIDINES: RETHINKING THEIR APPLICATION AND MANIPULATION IN SYNTHESIS Christopher R.
Butler Septem INTRODUCTION Aziridines (1) have been synthetic targets as well as useful building blocks in synthesis since Gabriel’s discovery of the smallest nitrogen containing heterocycle.1,2 Attracted by the increased strain and unique reactivity of the three-membered ring, synthetic.
In sharp contrasts to S‐(alkynyl)sulfonium salts, S‐alkenyl derivatives 38 have been widely employed as Michael acceptors since decades; being their use as ethylene transfer reagents for the synthesis of cyclopropanes and aziridines one of their most relevant applications in classical synthetic chemistry.
38 On the other hand, the range of.