Aqua one-pot, three-component synthesis of dihydropyrano[3,2-c]chromenes and amino-benzochromenes catalyzed by sodium malonate
作者:Hamzeh Kiyani、Mohsen Tazari
DOI:10.1007/s11164-017-3011-7
日期:2017.11
at their synthesis. In this contribution, sodium malonate was employed for the first time as an efficient catalyst for the one-pot, three-component tandem Knoevenagel–cyclocondensation reaction of 4-hydroxycoumarin (or naphthols), malononitrile/ethyl cyanoacetate, and various aldehydes. These compounds underwent Knoevenagel–Michael–Thorpe–Ziegler cyclization upon heating at 70 °C in water to give the
的二氢吡喃并广泛的生物学性质并[3,2- c ^ ]色烯,2-氨基-4-芳基-4- ħ -苯并[ ħ ]色烯,和3-氨基-1-芳基- 1 H ^ -苯并[ ˚F ] chromenes导致人们为开发针对其合成的极为有效的合成方案付出了更多的努力。在这一贡献中,丙二酸钠首次被用作有效的催化剂,用于4-羟基香豆素(或萘酚),丙二腈/氰基乙酸乙酯和各种醛的单锅,三组分串联式Knoevenagel-环缩合反应。这些化合物在水中于70°C加热后经历了Knoevenagel–Michael–Thorpe–Ziegler环化反应,从而得到了各自具有药用价值的二氢吡喃基[3,2- c ] chromenes和氨基苯并二苯甲基。该方法通用且适用于许多基材,因为它不需要诸如微波,超声和球磨之类的专用设备。而且,这种高产率方案的显着特征是绿色反应条件,使用可商购的催化剂,通过简单过滤的简单纯化方法以及相对较短的反应时间。