2.7 Metal-Catalyzed (4 + 3) Cycloadditions Involving Allylic Cations
Book
Editors: Gao, S.; Ma, S.
Title: Metal-Catalyzed Cyclization Reactions 2
Print ISBN: 9783131998118; Online ISBN: 9783132404823; Book DOI: 10.1055/b-004-129734
1st edition © 2016 Georg Thieme Verlag KG
Georg Thieme Verlag, Stuttgart
Subjects: Organic Chemistry;Chemical Reactions, Catalysis;Organometallic Chemistry;Laboratory Techniques, Stoichiometry
Science of Synthesis Reference Libraries
Parent publication
Title: Science of Synthesis
DOI: 10.1055/b-00000101
Series Editors: Carreira, E. M.; Decicco, C. P.; Fürstner, A.; Koch, G.; Molander, G.; Schaumann, E.; Shibasaki, M.; Thomas, E. J.; Trost, B. M.
Type: Multivolume Edition
Abstract
![](https://www.thieme-connect.de/media/10.1055-b-004-129734/thumbnails/a_212mcp.jpg)
The (4 + 3)-cycloaddition reaction is a reaction between an allylic cation and diene. It is a powerful process and one of the few reactions that directly generates seven-membered ring systems. This reaction exhibits high levels of diastereoselectivity and regioselectivity, which makes it attractive for the rapid construction of complex targets. Several select, reliable, and reproducible methods for the generation and capture of allylic cations by 1,3-dienes using metal catalysis or mediation are presented in this review along with some representative examples of the use of (4 + 3) cycloadditions in the synthesis of natural products.
Key words
(4 + 3) cycloaddition - intramolecular - intermolecular - allylic cations - oxyallylic cations - chiral cations - 1,3-dienes - regioselective - diastereoselective - stereoselective - asymmetric - enantioselective - metal-catalyzed - metal-mediated- 34 Alonso I, Trillo B, López F, Montserrat S, Ujaque G, Castedo L, Lledós A, Mascareñas JL. J. Am. Chem. Soc. 2009; 131: 13020
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