Publikationen - Natur- und Wirkstoffchemie
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- Wessjohann, L. (2)
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Wessjohann, L.; Skattebøl, L.; de Meijere, A.; New short syntheses of isoquinoline-4-carboxylic acid and 2-aza-3,3a-dihydroazulene-3a-carboxylic acid derivatives J. Chem. Soc., Chem. Commun. 1990, 574-576, (1990) DOI: 10.1039/C39900000574
Cyclopropylideneacetates (2a,b) undergo a formal [2 + 4] cycloaddition with (diphenylmethylene)amine (DPMA-H)(1) to yield dihydro-1-phenylisoquinoline-4-carboxylate (8a) and 1-phenylisoquinoline-4-carboxylate (7b); the Michael adduct of DPMA-H onto (2b), on the other hand, under basic conditions gives 1-phenyl-2-aza-azulene-3a-carboxylate (12) exclusively.
de Meijere, A.; Wessjohann, L.; Tailoring the Reactivity of Small Ring Building Blocks for Organic Synthesis Synlett 1990, 20-32, (1990) DOI: 10.1055/s-1990-20975
The syntheses and reactivities of some new cyclopropane containing C5-building blocks with composite functionalities are described. Recent applications of cyclopropylideneacetates in short syntheses of spirocyclopropane-annulated heterocycles and cyclopropane-containing biologically active compounds are demonstrated. Cyclopropylacetylenes are employed as cyclopentane annulation reagents and are particularly useful in the construction of terpenoid frameworks. 1. Introduction 2. The Initial Experiment: 1-Chloro-1-(trichlorovinyl)cyclopropanes from Olefins 3. Cyclopropylideneacetates 4. Cyclopropylacetylenes 5. Conclusion