Studies on Rhodium-Catalyzed (5+2) Cocyclization Rections.pdf

Studies on Rhodium-Catalyzed (5+2) Cocyclization Rections

Hermann Wegner

The first part of this thesis dealt with the a new kind of precursors for transition metalcatalyzed cocyclization reactions containing a vinylbicyclopropyl unit, their synthesis and their behavior in cocyclization reactions. By introducing a second cyclopropane the catalyst might open this ring as well after insertion into the first cyclopropane ring. The ¿basic¿ formal (5+2) cycloaddition reaction would be extended to a (5+2+3) cocyclization reaction to form ten-membered rings. In addition to the importance as a new synthetic tool valuable insights into the mechanism of transition metal-catalyzed cocyclization reactions of vinylcyclopropanes are gained.

29 Sep 2005 ... Organic Letters, Accounts of Chemical Research, ACS Applied Bio ... Transition- metal-catalyzed [2 + 2 + 2] cycloaddition of unsaturated motifs is a ... reaction conditions using chiral rhodium and iridium complexes with ... With enyne 1e, the reaction proceeded with high enantioselectivity (entries 5 and 6). 1 Mar 2018 ... Ru3(CO)12-catalyzed divergent ring-opening coupling reactions of a ... [RhCl(η4- 1,5-cod)]2 realizes the catalytic ring-opening cocyclization of ...

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Studies on Rhodium-Catalyzed (5+2) Cocyclization Rections.pdf

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The ’basic’ formal [5+2] cycloaddition reaction would be extended to a [5+2+3] cocyclization reaction to form ten-membered rings. In addition to the importance as a new synthetic tool valuable insights into the mechanism of transition metal-catalyzed cocyclization reactions of vinylcyclopropanes are gained.

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Uncatalyzed Reactions 283 Copper(I)-catalyzed Reactions 292 Substitution Reactions 293 Acylation Reactions 303 Addition Reactions 305 Michael Additions 309 Palladium- and Nickel-catalyzed Reactions 316 Reactions Catalyzed by Titanium and Zirconium(IV) Complexes Reactions of Zinc Organometallics Catalyzed by Cobalt, Iron or Manganese Complexes 332 Conclusion 333

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The ’basic’ formal [5+2] cycloaddition reaction would be extended to a [5+2+3] cocyclization reaction to form ten-membered rings. In addition to the importance as a new synthetic tool valuable insights into the mechanism of transition metal-catalyzed cocyclization reactions of vinylcyclopropanes are gained. Three-Component Cycloadditions: The First …