Electrochemical synthesis of oxazoles <i>via</i> a phosphine-mediated deoxygenative [3 + 2] cycloaddition of carboxylic acids
作者:Xiao Zhang、Qilin Yuan、Haoxiang Zhang、Zheng-Jia Shen、Lulu Zhao、Chao Yang、Lin Guo、Wujiong Xia
DOI:10.1039/d2gc04559a
日期:——
A direct electrochemical phosphine-mediated deoxygenative [3 + 2] cycloaddition strategy for oxazole synthesis is described, employing naturally abundant and inexpensive carboxylic acids as starting materials. This method is performed in a green and sustainable catalytic system, and avoids the use of transition metals and toxic oxidants. Good functional group tolerance, the success of gram-scale experiments
描述了用于恶唑合成的直接电化学膦介导的脱氧 [3 + 2] 环加成策略,使用天然丰富且廉价的羧酸作为起始材料。该方法在绿色和可持续的催化系统中进行,避免使用过渡金属和有毒氧化剂。良好的官能团耐受性、克级实验的成功和药物分子的后期修饰极大地突出了我们方法的潜在适用性。机理研究表明,通过阳极氧化生成酰氧基磷离子作为关键中间体,然后进行亲核取代和与异氰化物的环加成反应。