Template-directed synthesis of macrocyclic aminopyridines: azacalix[n](2,6)pyridines (n=3, 4)
摘要:
Template-induced synthetic routes for azacalix[n](2,6)pyridines (n = 3, 4) have been elaborated. The proton and nickel ion served as the efficient template for the cyclization reactions, and the presence of the templates preferentially afforded the cyclic trimers and tetramers in moderate to good yields, respectively. The compatibility of the cyclic tetramer with nickel ion was also confirmed by X-ray crystallography. (C) 2014 Elsevier Ltd. All rights reserved.
Synthetic routes for N-(p-tolyl)-substituted azacalix[n](2,6)pyridines via Cu- and Pd-catalyzed aryl amination reactions have been elaborated, and the macrocycles constructed of various numbers (n = 3-8, and 10) of a N-(p-tolyl)aminopyridine recurring unit have been isolated. A cyclic trimer 1 was obtained in good yield. Molecular structures of some macrocycles and a Cu(I) complex of 1 were determined
Template-induced synthetic routes for azacalix[n](2,6)pyridines (n = 3, 4) have been elaborated. The proton and nickel ion served as the efficient template for the cyclization reactions, and the presence of the templates preferentially afforded the cyclic trimers and tetramers in moderate to good yields, respectively. The compatibility of the cyclic tetramer with nickel ion was also confirmed by X-ray crystallography. (C) 2014 Elsevier Ltd. All rights reserved.