中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | methyl 2,4-dimethoxy-6-(methoxycarbonylmethyl)benzoate | 6512-26-1 | C13H16O6 | 268.266 |
—— | methyl 2-carboxy-3,5-dimethoxyphenylacetate | 83375-20-6 | C12H14O6 | 254.24 |
(2-羧基-3-羟基-5-甲氧基苯基)乙酸 | (2-carboxy-3-hydroxy-5-methoxyphenyl)acetic acid | 267662-48-6 | C10H10O6 | 226.186 |
8-羟基-6-甲氧基-1H-2-苯并吡喃-1,3-(4H)-二酮 | 8-hydroxy-6-methoxy-1H-2-benzopyran-1,3(4H)-dione | 267662-49-7 | C10H8O5 | 208.171 |
—— | 2-carboxymethyl-4,6-dimethoxy-benzoic acid | 4778-99-8 | C11H12O6 | 240.213 |
—— | 6,8-dimethoxy-1H-2-benzopyran-1,3(4H)-dione | 82218-06-2 | C11H10O5 | 222.197 |
—— | dimethyl 5-methoxy-3-trifluormethansulfonyloxy-homophthalate | 1218798-83-4 | C13H13F3O8S | 386.303 |
Oxy-substituted homophthalic anhydrides have been synthesized by cycloaddition of di- and tri-oxy butadienes to the allenic diester (1). By base-catalysed cycloaddition to appropriate benzoquinones they have afforded new syntheses of viocristin (19), isoviocristin (20) and analogous 1,4-anthraquinones. Related chemistry has led to the naphthalene (34) and the anhydride (35), intermediates in published syntheses of semivioxanthin and 6- methylpretetramid respectively.