Microwave-Assisted Solid-Phase Synthesis of a 1,2-Disubstituted Benzimidazole Library by Using a Phosphonium Linker
作者:Natalia Ríos、Cecilia Chavarría、Carmen Gil、Williams Porcal
DOI:10.1002/jhet.1619
日期:2013.5
microwave‐assisted solid‐phase method for the synthesis of 5‐methyl‐1,2‐disubstituted benzimidazoles derivatives has been developed. The phosphonium linker, obtained by reaction between polymer‐supported triphenylphosphine and 4‐fluoro‐3‐nitrobenzyl iodide, underwent aromatic substitution with primary amines, followed by one‐pot reaction with aldehydes in the presence of SnCl2·2H2O, yielded the benzimidazole system
已经开发了一种高效,快速的微波辅助固相合成方法,用于合成5-甲基-1,2-二取代的苯并咪唑衍生物。通过聚合物负载的三苯基膦与4-氟-3-硝基苄基碘的反应获得的phospho连接基,用伯胺进行芳族取代,然后在SnCl 2 ·2H 2 O的存在下与醛进行单锅反应,生成了微波辐射下苯并咪唑体系。在微波辐射下用NaOH从树脂中释放出最终产物,并以高纯度和良好的总收率获得。