Azulene-substituted pyridines and pyridinium salts. Synthesis and structure. 1. Azulene-substituted pyridines
作者:Alexandru C. Razus、Liviu Birzan、Claudia Pavel、Oana Lehadus、Andreea Corbu、Filip Chiraleu、Cristian Enache
DOI:10.1002/jhet.5570440142
日期:2007.1
4-Azulen-1-yl substituted 2,6-dimethyl-and 2,6-diphenyl-pyridines are obtained in good yields from the reaction of corresponding 4-azulen-1-yl-pyranylium salts and ammonium acetate in ethanol or starting from 4-chloro-2,6-diphenyl-pyranylium salts in two steps: reaction with azulenes followed by in situ treatment with ammonium acetate. The effect of substitution at the 3-position of the heterocycle