Enaminones in heterocyclic synthesis: A new regioselective synthesis of 2,3,6‐trisubstituted pyridines, 6‐substituted‐3‐aroylpyridines and 1,3,5‐triaroylbenzenes
作者:Balkis Al‐Saleh、Mervat Mohammed Abdelkhalik、Afaf Mohammed Eltoukhy、Mohammed Hilmy Elnagdi
DOI:10.1002/jhet.5570390528
日期:2002.9
1-Substituted-3-dimethylaminopropenones 1a-d reacted with acetylacetone and with ethyl acetoacetate to yield regioselectively 2,3,6-trisubstituted pyridines. Refluxing 1a-d in acetic acid/ammonium acetate resulted in the formation of 6-substituted-3-aroylpyridines, whereas refluxing in acetic acid alone afforded 1,3,5-triaroylbenzene.
1-取代的3-二甲基氨基丙烯酮1a-d与乙酰丙酮和乙酰乙酸乙酯反应以产生区域选择性的2,3,6-三取代的吡啶。在乙酸/乙酸铵中回流1a-d导致形成6-取代的3-芳酰基吡啶,而仅在乙酸中回流则得到1,3,5-三芳酰基苯。