Potassium Periodate Mediated Oxidative Cyclodesulfurization toward Benzofused Nitrogen Heterocycles
作者:Mookda Pattarawarapan、Chuthamat Duangkamol、Wong Phakhodee
DOI:10.1055/s-0039-1690855
日期:2020.7
A convenient oxidative cyclodesulfurization method toward the synthesis of benzofused nitrogen heterocycles using inexpensive and readily available potassium periodate as an oxidant was developed. Upon treating isothiocyanates with ortho-substituted anilines bearing N,N-, N,O-, and N,S-bis-nucleophiles, followed by an intramolecular cyclization of the in situ generated monothioureas, substituted 2-aminobenzazole
开发了一种方便的氧化环脱硫方法,该方法使用廉价且容易获得的高碘酸钾作为氧化剂合成苯并稠合的氮杂环。用带有N,N-,N,O-和N,S的邻位取代苯胺处理异硫氰酸酯时-双亲核试剂,然后分子内环化原位生成的单硫脲,取代的2-氨基苯并唑系列,其收率很高,收率很高。该方案可在两种底物上容纳各种取代基,同时相对于其他氧化偶联反应,可实现更高效,更绿色,操作更简单的过程。四环喹唑啉酮衍生物还可以在单一制备步骤中以高收率获得,并且无需色谱分离。