A facile and rapid one-step synthesis of 8-substituted xanthine derivatives via tandem ring closure at room temperature
作者:Prabal Bandyopadhyay、Sumit K. Agrawal、Manisha Sathe、Pratibha Sharma、M.P. Kaushik
DOI:10.1016/j.tet.2012.03.050
日期:2012.5
N-Bromo succinimide (NBS) was found to be an efficient and regioselective reagent in combination with AIBN for an unprecedented, facile and rapid one-step synthesis of 8-substituted xanthine derivatives at room temperature. The inexpensive, nontoxic and readily available NBS efficiently promoted the condensation of several aryl/cycloaryl/heteroaryl aldehydes with 5,6-diamino-1,3-dimethyluracils in
N-溴代琥珀酰亚胺(NBS)与AIBN结合使用是一种高效且区域选择性的试剂,可在室温下空前,简便,快速地一步合成8-取代的黄嘌呤衍生物。在催化量的AIBN存在下,通过自由基链反应,在一步催化过程中,廉价,无毒且易于获得的NBS有效地促进了几种芳基/环芳基/杂芳基醛与5,6-二氨基-1,3-二甲基尿嘧啶的缩合。该方案的显着优点是反应时间短,反应条件温和,后处理简单,无需色谱分离,使用无害试剂/溶剂且适用于多种底物。