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A combination of tandem amine-exchange/heterocyclization and biaryl coupling reactions for the straightforward preparation of phenanthro[9,10-d]pyrazoles.
- Source :
-
The Journal of organic chemistry [J Org Chem] 2000 Oct 20; Vol. 65 (21), pp. 7010-9. - Publication Year :
- 2000
-
Abstract
- The tandem amine-exchange/heterocyclization of enaminoketones is successfully applied to the regioselective preparation of a series of new 4,5-diarylpyrazoles by reaction of phenylhydrazine and several 3-N,N-(dimethylamino)-1,2-diarylpropenones. The comparison of a vast array of biaryl coupling procedures provides general, complementary approaches to new phenanthro[9,10-d]pyrazoles. The most efficient procedures for this final step in the construction of the tetracyclic system are based on a Stille-type tandem stannylation-biaryl coupling of o,o'-dihalogenated diarylpyrazoles and an hypervalent iodine-mediated nonphenolic oxidative coupling of nonhalogenated precursors.
Details
- Language :
- English
- ISSN :
- 0022-3263
- Volume :
- 65
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- The Journal of organic chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 11031023
- Full Text :
- https://doi.org/10.1021/jo000609i