Depending upon the conditions of solvent and temperature, oxidation of the readily accessible 2,3,6,7-tetramethoxy-9,10-dimethylphenanthrene (3) with Na2Cr2O7 gave 2,3,6,7-tetramethoxyphenanthrene-9,10-dicarboxylic acid anhydride (1), 2,2′-diacetyl-4,4′,5,5′-tetramethoxybiphenyl (4), or the new aldehyde 5. Compounds 1 and 4 have been obtained previously only by oxidative degradation of the alkaloid tylophorine (2); their ready availability may be of value for the synthesis of pharmacologically active compounds related to 2.
根据溶剂和温度的条件,使用Na2Cr2O7氧化易于接近的2,3,6,7-四甲氧基-9,10-二甲基菲(3)会产生2,3,6,7-四甲氧基菲-9,10-二羧酸酐(1),2,2'-二乙酰-4,4',5,5'-四甲氧基联苯(4)或新的醛5。化合物1和4仅通过生物碱tylophorine(2)的氧化降解而得到;它们的易得性可能对于合成与2相关的药理活性化合物有价值。