Studies on Quinones. Part 30. Synthesis of Benzo[<i>b</i>]thiophene-4, 7-Quinones
作者:Jaime A. Valderrama、Claudio Valderrama
DOI:10.1080/00397919708006822
日期:1997.6
Abstract The synthesis of a variety of benzo[b]thiophene-4, 7-quinones (4a-f), by oxidative demethylation of the corresponding 4, 7-dimethoxybenzo[b]thiophenes (3a-f), with cerium (IV) ammonium nitrate is reported. Heterocycles (3a, b), were prepared by cyclization of the corresponding 2, 5-dimethoxy-6-nitrobenzaldehyde (1a), and 2, 5-dimethoxy-6-nitroacetophenone (1b), with methyl thioglycolate.
摘要 通过氧化去甲基化相应的 4, 7-二甲氧基苯并 [b] 噻吩 (3a-f) 与铈 (IV),合成多种苯并 [b] 噻吩-4, 7-醌 (4a-f)据报道硝酸铵。杂环化合物 (3a, b) 是通过相应的 2, 5-二甲氧基-6-硝基苯甲醛 (1a) 和 2, 5-二甲氧基-6-硝基苯乙酮 (1b) 与巯基乙酸甲酯环化制备的。