Bicyclopropylidene. A unique tetrasubstituted alkene and versatile C-6-building block for organic synthesis
2000 | conference paper. A publication with affiliation to the University of Göttingen.
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Bicyclopropylidene. A unique tetrasubstituted alkene and versatile C-6-building block for organic synthesis
Meijere, A. de ; Kozhushkov, S. I.; Spath, T.; Seebach, M. von; Lohr, S.; Nuske, H. & Pohlmann, T. et al. (2000)
Pure and Applied Chemistry, 72(9) pp. 1745-1756. 13th International Conference on Organic Synthesis (ICOS-13), WARSAW, POLAND.
Res triangle pk: Int Union Pure Applied Chemistry.
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- Authors
- Meijere, Armin de ; Kozhushkov, Sergei I.; Spath, T.; Seebach, M. von; Lohr, S.; Nuske, H.; Pohlmann, T.; Es-Sayed, M.; Brase, S.
- Abstract
- Bicyclopropylidene (4), now readily available in preparatively viable quantities, is evolving as a useful C-6 building block for organic synthesis due to its enhanced reactivity at the C-H, the C=C, as well as both types of C-C single bonds. Monosubstituted derivatives are accessible by deprotonation/electrophilic substitution. Di- and tetrasubstituted bicyclopropylidenes are best made by copper-mediated reductive dimerization of bromolithiocarbenoids. The 1,3-dipolar cycloadducts of nitrones rearrange to spirocyclopropanated piperidones, palladium-catalyzed codimerizations with acrylates occur with opening of one of the rings to yield precursors to bicyclo[3.3.0]octene and bicyclo[5.3.0]decene skeletons. Silicon-heteroatom bonds can be added across the double bond of 4 under palladium catalysis just like across a C=C triple bond, and carbopalladation of the double bond in 4 occurs more rapidly than that in an acrylate. A variety of new three-component reactions of 4 with alkenyl as well as aryl halides and dienophiles have been developed and extended to be carried out in a combinatorial sense, even on a polymer support, with an additional dimension added in the cleavage step. Most of the reported reactions of bicyclopropylidene (4) proceed with good to excellent yields.
- Issue Date
- 2000
- Publisher
- Int Union Pure Applied Chemistry
- Journal
- Pure and Applied Chemistry
- Conference
- 13th International Conference on Organic Synthesis (ICOS-13)
- Conference Place
- WARSAW, POLAND
- ISSN
- 0033-4545