Autori: Alexandru C. Razus, Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Cristina Corbu and Cristian Enache

Editorial: J. Heterocyclic Chem, 43, p.963-77, 2006.

Rezumat:

The synthesis of 4-azulene-substituted 2,6-diphenyl- and 2,6-dimethyl-pyranylium salts and 2-azulene-substituted 4,6-dimethyl-pyranylium salts by nucleophilic substitution at pyranylium moiety with various azulenes was studied. The starting materials for 2,6-diphenyl derivatives were 4 chlorinated pyranylium salts. They were obtained by the halogenation with PCl5 of corresponding pyranones and were used either in situ or after separation. For the synthesis of dimethyl derivatives the corresponding pyranones were treated with POCl3 and the resulted intermediate was reacted in situ with azulene. 4-Azulene-2,6-diphenyl-pyranylium salts substituted at C(3), compounds with potential enantiomerism properties, were also obtained.

Cuvinte cheie: pyranylium salts, azulene