Solvent-free, one-pot synthesis and biological evaluation of some new dipyrazolo [3,4-b:4′,3′-e]pyranylquinolones and their precursors
作者:Narsidas J. Parmar、Bhavesh R. Pansuriya、Bhagyashri D. Parmar、Hitesh A. Barad
DOI:10.1007/s00044-013-0608-2
日期:2014.1
One-pot synthesis of 24 new compounds, belonging to three families; dipyrazolo[3,4-b:4′,3′-e]pyranylquinolones 7a–h and its precursors (pyrazolonylidene)methylquinolones 5a–h and 4,4′-[(quinolinyl)methylene]bispyrazols 6a–h, 8 from each, has been achieved in the presence of catalyst tetrabutylammonium hydrogen sulfate (TBA–HS) in solvent-free conditions. In addition to assuring chromatography-free
一锅合成24种新化合物,属于三个家族; dipyrazolo [3,4- b:4',3'- e ]吡喃基喹诺酮类化合物7a–h及其前体(吡唑基亚苄基)甲基喹诺酮类5a–h和4,4'-[((喹啉基)亚甲基]双吡唑类化合物6a–h,各有8种在无溶剂条件下,在催化剂硫酸四丁铵硫酸氢盐(TBA–HS)的存在下已达到。除了确保无色谱分离产物外,只要改变吡唑啉酮的温度和量,该方法还可以使反应以区域选择性方式进行。在100°C时,醛3和吡唑啉酮4的1:1混合物进行Knoevenagel缩合反应,相同的反应物以1:2的比例摄取,主要是多米诺/ Knoevenagel–Michael反应。然而,在120°C时,多米诺/诺文AGEL-迈克尔加合物转化为环化产物,突显了新的多米诺/诺文AGEL-Michael环化合成序列。所有杂环的结构已通过质量,IR和NMR光谱数据证实。基于2D NMR NOESY实验,还证