The Use of Anilinodihydrothiophenes in the Synthesis of Novel Heterocyclic Compounds
摘要:
2-Phenylamino-4-oxo-4,5-dihydrothiophenes 1 and 6 were used for the preparation of 2-arylidenethieno[2,3-b]pyridine and benzo[b]thiophene derivatives 3, 8, and 11. The structures of the hitherto unknown ring systems have been confirmed by analytical and spectral methods.
在氢化钠的存在下,异硫氰酸苯基酯与γ-氯乙酰乙酸乙酯反应,生成2-苯胺基-4-氧代-4,5-二氢噻吩-3-羧酸乙酯(1b)。化合物(1b)表示酮亚甲基化合物的典型反应。用Vilsmeier试剂和三氯氧化磷得到氯甲酰噻吩(10)。从(1b)与亚硫酰氯获得可能的硫衍生物(11)。进一步利用氯甲酰基噻吩(10)可得到正常的芳族醛缩合产物,并与巯基乙酸酯一起生成噻吩并[3,2- b ]噻吩(25)。