Regioselective synthesis of imidazo[1,2-a][1,3,5]triazines and 3,4-dihydroimidazo[1,2-a][1,3,5]triazines from [1,3,5]triazin-2,4-diamines
摘要:
An efficient and practical procedure was developed to prepare novel imidazo[1,2-a][1,3,5]triazines and 3,4-dihydroimidazo[1,2-a][1,3,5]triazines with a good regioselectivity and high yields, starting from di-cyandiamide and the corresponding arylamines. Mechanistic studies for the subsequent cyclo-condensation with chloroacetaldehyde support a pathway, which begins with the displacement of the chloro atom activated by an adjacent CO group, followed by cyclization and dehydration. (C) 2013 Elsevier Ltd. All rights reserved.
A New One-Pot Three-Component Synthesis of 4-Aryl-6-cycloamino-1,3,5-triazin-2-amines under Microwave Irradiation
作者:Anton V. Dolzhenko、Muhammad Syafiq Bin Shahari、Ahmad Junaid、Edward R. T. Tiekink
DOI:10.1055/a-1401-2795
日期:2021.7
A new method for the fastsynthesis of diverse 4-aryl-6-cycloamino-1,3,5-triazin-2-amines was developed. The synthesis is performed undermicrowaveirradiation in a one-pot manner from cyanoguanidine, aromaticaldehydes, and cyclic amines. Their three-component reaction in the presence of hydrochloric acid produced dihydrotriazines, which were then converted (without isolation) into the targeted compounds