The synthesis of isoquinolines, indoles and benzthiophen by an improved Pomeranz-Fritsch reaction, using boron trifluoride in trifluoroacetic anhydride
作者:M.J. Bevis、E.J. Forbes、N.N. Naik、B.C. Uff
DOI:10.1016/s0040-4020(01)90874-9
日期:1971.1
Pomeranz-Fritsch cyclisations are reported using a new reagent boron trifluoride-trifluoroacetic anhydride. Isoquinolines carrying 7-OMe groups have been prepared in good yields and the method extended to the formation of N-substituted indoles and of benzthiophen from the corresponding acetals. Benzofuran could not be obtained by this procedure nor could a Bischler-Napieralski type cyclisation be induced
据报道,使用一种新的三氟化硼-三氟乙酸酐试剂进行了Pomeranz-Fritsch环化反应。带有7-OMe基团的异喹啉已经以高收率制备,并且该方法扩展到由相应的缩醛形成N-取代的吲哚和苯并噻吩。用这种方法不能得到苯并呋喃,也不能诱导Bischler-Napieralski型环化反应。在后一种情况下,当适当活化时,起始酰胺的芳环被乙酰化。