反应详情

The starting material, 4-indanol (i.e., Formula 5) is dissolved in an organic acid, preferably glacial acetic acid, at a temperature in the range of about 20°-30° C., preferably about room temperature. To this solution is added in a gradual manner a solution of concentrated nitric acid (about 1 to 2 molar equivalents, preferably about 1.5 molar equivalents) in an organic acid, preferably glacial acetic acid. The reaction mixture is stirred for a period of about 15 minutes to 1 hour, preferably about 30 minutes, at a temperature in the range of 20°-30° C., preferably about room temperature. When the reaction is substantially complete, the 4-hydroxy-5-nitrobenzocyclopentene of Formula 6 is isolated and purified by conventional means, preferably by flash column chromatography.