Rapid <i>in situ</i> generation of 2-(halomethyl)-5-phenylfuran and nucleophilic addition in a microflow reactor
作者:Yuma Matsuura、Shinichiro Fuse
DOI:10.1039/d4ob00358f
日期:——
by the highly reactive halomethylfurans. This paper reports the successful rapid synthesis of various 2,5-disubstituted furans using microflow technology, which suppresses undesired reactions including dimerization and ring opening of the furans. We observed that Brønsted acids had a significant effect on the nucleophilic substitution reaction and the use of HBr and HI gave the best results. A plausible
2,5-二取代呋喃常见于药物和生物活性天然产物中。与呋喃环相邻的碳原子上的亲核取代反应可用于生产各种呋喃衍生物。然而,5-取代的2-卤代甲基呋喃的形成和随后的亲核取代反应通常受到高反应性卤代甲基呋喃引起的严重不良反应的限制。本文报道了利用微流技术成功快速合成各种2,5-二取代呋喃,抑制了呋喃二聚和开环等不良反应。我们观察到布朗斯台德酸对亲核取代反应有显着影响,并且使用 HBr 和 HI 给出了最好的结果。提出了所开发方法中布朗斯台德酸介导的亲核取代的合理机制。