Iodine-Catalyzed Synthesis of Chalcogenophenes by the Reaction of 1,3-Dienyl Bromides and Potassium Selenocyanate/Potassium Sulfide (KSeCN/K<sub>2</sub>
S)
作者:Pintu Maity、Brindaban C. Ranu
DOI:10.1002/adsc.201701232
日期:2017.12.19
expensive and readily available. Several diversely substituted selenophenes and thiophenes have been obtained by this procedure in high yields. Using this procedure 2‐(4‐chlorophenyl)thiophene, a key intermediate for the synthesis of a melanin concentrating hormone receptor ligand involved in the treatment of eating disorders, weight gain, obesity, depression and anxiety has been synthesized. Although the
通常,可用于合成硫属元素金属的方法与苛刻条件,使用昂贵的金属,适用性广,纯化过程繁琐和收率低的缺点有关。为避免这些缺点,芳基取代的1,3-二烯基溴化物与硒氰酸钾/硫化钾(KSeCN / K 2S)导致了相应的硒代苯并噻吩的开发。碘相对较温和,价格便宜并且容易获得。通过该方法已经以高收率获得了几种不同取代的硒代苯并噻吩。使用该程序2-(4-氯苯基)噻吩,一种合成黑色素浓缩激素受体配体的关键中间体,参与了饮食失调,体重增加,肥胖,抑郁和焦虑症的治疗。尽管该反应基本上是一锅的,但它分两个步骤进行,涉及硒代氰酸酯/硫醇盐中间体,从而导致硒烯/噻吩。简单的操作,使用廉价的试剂和无金属的工艺使该程序对于容易获得取代的硒代苯并噻吩具有更大的吸引力。