Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/10634
Title: Chemistry of Diazafulvenium Methides in the Synthesis of Functionalized Pyrazoles
Authors: Melo, Teresa M. V. D. Pinho e 
Nunes, Cláudio M. 
Soares, Maria I. L. 
Paixão, José A. 
Beja, Ana Matos 
Silva, Manuela Ramos 
Issue Date: 8-Jun-2007
Publisher: American Chemical Society
Citation: The Journal of Organic Chemistry. 72:12 (2007) 4406-4415
Abstract: The chemistry of diazafulvenium methides generated by the thermal extrusion of sulfur dioxide from 2,2-dioxo-1H,3H-pyrazolo[1,5-c] [1,3]thiazoles is described. The diazafulvenium methides unsubstituted at C-7 participate in [8π + 2π] cycloadditions giving pyrazolo-annulated heterocycles resulting from the addition across the 1,7-position. 1-Methyl-diazafulvenium methides and 7,7-dimethyl-diazafulvenium methides undergo intramolecular sigmatropic [1,8]H shifts giving vinyl-1H-pyrazoles.
URI: http://hdl.handle.net/10316/10634
ISSN: 0022-3263
DOI: 10.1021/jo070265x
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais
FCTUC Química - Artigos em Revistas Internacionais

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