A new method for the synthesis of substituted indeno[1,2-<i>b</i>]thiophene with subsequent ring expansion to form substituted thieno[3,2-<i>c</i>]quinoline
作者:Lyle W. Castle、Tarek Abou Elmaaty
DOI:10.1002/jhet.5570430316
日期:2006.5
2-phenyl-4H-indeno[1,2-b]thiophene-4-one (4). Compound 4 was subsequently reacted with hydroxyl amine to form the oxime (5), which, upon treatment with polyphosphoric acid, underwent ring expansion (Beckmann rearrangement) to give 2-phenylthieno[3,2-c]quinoline-4(5H)one.
将2-Phenacylindan-1,3-dione(3)用Lawesson试剂(2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide)处理以形成2 -苯基-4 H-茚并[1,2 - b ]噻吩-4-酮(4)。随后使化合物4与羟胺反应形成肟(5),将其用多磷酸处理后进行扩环(贝克曼重排),得到2-苯基硫代[3,2 - c ]喹啉-4(5 H)。一。