Reaction of 3-formylchromone-<i>N</i>-benzoylhydrazone with ketenes. Synthesis and structural studies of chromone 1,3,4-oxadiazolines
作者:George C. Kaspentakis、Constantinos A. Tsoleridis、Julia Stephanidou-Stephanatou
DOI:10.1002/jhet.5570440223
日期:2007.3
The reaction of 3-formylchromone-N-benzoylhydrazone with ketenes, prepared in situ from the corresponding acid chlorides 2a-d and the mixed anhydride 2e was studied. In all cases 2-(4′-oxo-4′H-3′-chromyl)-5-phenyl-2,3-dihydro-1,3,4-oxadiazoles (3) were isolated in yields varying from 40 to 80%. A full structure assignment of all products has been made on the basis of 1D and 2-D (COSY H-H, COSY C-H
研究了由相应的酰氯2a-d和混合酸酐2e原位制备的3-甲酰基色酮-N-苯甲酰hydr与乙烯酮的反应。在所有情况下的2-(4'-氧代-4' ħ -3'-铬酰)-5-苯基-2,3-二氢-1,3,4-恶二唑(3)的产率变化,从40至80,分离%。已基于1D和2-D(COSY HH,COZY CH,COLOC CH)NMR光谱对所有产品进行了完整的结构归属。基于理论方法和实验结果,还提出了合理的反应机理。