Metal‐Free Oxidative Condensation of Catechols, Aldehydes and NH
<sub>4</sub>
OAc towards Benzoxazoles
作者:Shaofeng Wu、Dan Zhou、Furong Geng、Jianyu Dong、Lebin Su、Yongbo Zhou、Shuang‐Feng Yin
DOI:10.1002/adsc.202100249
日期:——
facile and green synthesis of such valuable compounds from easily available substrates will make a contribution to drug, material, and fine chemistry. A method for the synthesis of benzoxazoles from catechols, aldehydes and ammonium acetate is developed using NaIO4 as oxidant under metal- and additive-free conditions. A broad range of benzoxazoles including some fluorescent whitening agents, JTP-426467
苯并恶唑广泛存在于生物活性化合物、天然产物、药物和功能材料中。因此,从容易获得的底物轻松和绿色合成这些有价值的化合物将为药物、材料和精细化学做出贡献。开发了一种在无金属和无添加剂条件下使用 NaIO 4作为氧化剂从儿茶酚、醛和醋酸铵合成苯并恶唑的方法。广泛的苯并恶唑,包括一些荧光增白剂、JTP-426467 和 tafamidis 类似物,以 56-95% 的产率合成,具有出色的官能团耐受性。机械研究表明,一个有趣的o-亚氨基环己二烯醇中间体参与反应。该协议的这些显着特点使其成为苯并恶唑合成的替代方案。