作者:A. N. Grinev、S. A. Zotova、T. I. Mukhanova、V. M. Lyubchanskaya、G. Ya. Shvarts、R. D. Syubaev、M. D. Mashkovskii
DOI:10.1007/bf00777267
日期:1982.3
of the last compound with acetic anhydride in the presence of triethylamine gave the 0-acetyl derivative (I). Bromination of I by N-bromosuccinimide (NBS) with illumination in the presence of benzoyl peroxide led to 2-bromoethyl-3-carbethoxy-5-acetoxy-6-bromobenzofuran (Ii). When the last compound was reacted with thiophenol in an acid medium, substitution of the bromine atom for the phenylthio residue
5(2-Phenylthiomethyl+3-carbethoxy-6-bromobenzofuryl)oxy乙酸 (IV) 由已知的 2-methyl-3-carbethoxy-5-hydroxy-6-bromobenzofuran [6] 制备。在三乙胺存在下用乙酸酐酰化最后的化合物得到0-乙酰基衍生物(I)。在过氧化苯甲酰存在下,用 N-溴代琥珀酰亚胺 (NBS) 对 I 进行溴化,生成 2-溴乙基-3-carbethoxy-5-acetoxy-6-bromobenzofuran (Ii)。当最后一种化合物在酸性介质中与苯硫酚反应时,观察到溴原子取代了苯硫基残基和乙酰氧基的水解;2=苯硫甲基-3-碳乙氧基-5-羟基-6-溴苯并呋喃(III)由此形成。化合物III转化为钠衍生物,依次用溴乙酸酯和碱水溶液处理形成IV。