A new type of intramolecular cyclization of 1,5-bis[2-(E-3-oxo-3-phenylprop-1-enyl)-phenoxy]-3-oxapentane with 3-aminotriazole promoted by potassium ions was discovered. A cascade mechanism for the formation of crownophane with 4,7-dihydro[1,2,4]triazolo[1,5-a]-pyrimidine fragment was suggested. Effects of oligooxyethylene fragment of the chalcone podand and acid-base catalysis on the selectivity of the cyclocondensation processes and degree of oxidation of triazolopyrimidine fragments were studied. The product structures were confirmed by IR, 1H and 13C NMR spectroscopy and X-ray diffraction study.
发现了一种由
钾离子促进的1,5-双[2-(E-3-氧代-3-苯基丙-1-烯基)-苯氧基]-3-氧杂
戊烷与3-
氨基三唑的新型分子内环化反应。提出了
冠醚与4,7-二氢[1,2,4]三唑并[1,5-a]-
嘧啶片段形成级联机制。研究了
查尔酮萼片和酸碱催化对环缩合过程的选择性和三唑
嘧啶片段氧化程度的影响。通过红外、1H和13C核磁共振光谱以及X射线衍射研究确认了产物结构。