The use of polyphosphoric acid in the Pomeranz-Fritsch synthesis of isoquinolines
作者:M.J. Bevis、E.J. Forbes、B.C. Uff
DOI:10.1016/s0040-4020(01)82730-7
日期:1969.1
1-substituted isoquinolines have been synthesized by the Pomeranz-Fritsch procedure using polyphosphoric acid as cyclizing agent. Though giving only moderate yields the method was successful in all cases, particularly for the preparation of 8-substituted isoquinolines, which in most cases are unobtainable from cyclization using sulphuric acid. In addition, the 12H-[1]-benzoxepino[2.3.4-ij]isoquinoline system
使用多磷酸作为环化剂,通过Pomeranz-Fritsch方法已经合成了许多7,8和1-取代的异喹啉。尽管仅产生中等收率,但是该方法在所有情况下都是成功的,特别是对于制备8-取代的异喹啉,该方法在大多数情况下是无法通过使用硫酸环化获得的。此外,还详细说明了存在于苯那碱生物碱中的12 H- [1]-苯并庚因[2.3.4- ij ]异喹啉系统。