反应详情

In a manner similar to that of Example 23, 1 part of 2-amino-5,6-dihydroxy-3,4-dihydro-1(2H)-naphthalenone hydrobromide is reacted with 20 volume parts of cyclobutanone. Via 2-cyclobutylideneamino-5,6-dihydroxy-3,4-dihydro-1(2H)-naphthalenone, 0.5 part of 2-cyclobutylamino-1,5,6-trihydroxy-1,2,3,4-tetrahydronaphthalene hydrobromide is obtained as colorless crystals melting at 190°-200° C (decomposition). This product was identified as the compound according to Example 35 by mixed melting point.