Selective Synthesis of Halogeno Derivatives from 5-Acetoxytropolone
作者:Tomohiro Nagao、Akira Mori、Hitoshi Takeshita
DOI:10.1246/bcsj.62.451
日期:1989.2
5-Acetoxytropolone was successfully halogenated by means of benzyltrimethylammonium tribromide and sulfuryl chloride to give 3-halotropolones and 3,7-dihalotropolones which were converted to the corresponding halogenated p-tropoquinone derivatives. From 3,7-dihalo-p-tropoquinones, 3,4,7-trichloro-5-hydroxytropolone was prepared in good yields via a Thiele-type addition reaction with hydrochloric acid. By a similar treatment, 5-hydroxytropolone gave a complex mixture.