Nitration of 5,11-dihydroindolo[3,2-<i>b</i>]carbazoles and synthetic applications of their nitro-substituted derivatives
作者:Roman A Irgashev、Nikita A Kazin、Gennady L Rusinov、Valery N Charushin
DOI:10.3762/bjoc.13.136
日期:——
A new general approach to double nitration of 6,12-di(hetero)aryl-substituted and 6,12-unsubstituted 5,11-dialkyl-5,11-dihydroindolo[3,2-b]carbazoles by acetyl nitrate has been developed to obtain their 2,8-dinitro and 6,12-dinitro derivatives, respectively. A formation of mono-nitro derivatives (at C-2 or C-6) from the same indolo[3,2-b]carbazoles has also been observed in several cases. Reduction
已开发出一种新的通用方法,可通过乙酰硝酸酯双硝化6,12-二(杂)芳基取代的和6,12-未取代的5,11-二烷基-5,11-二氢吲哚[3,2-b]咔唑分别获得其2,8-二硝基和6,12-二硝基衍生物。在几种情况下,还观察到由相同的吲哚并[3,2-b]咔唑形成单硝基衍生物(在C-2或C-6处)。用锌粉和盐酸还原2-硝基和2,8-二硝基衍生物得到2-氨基-和2,8-二氨基取代的吲哚[3,2-b]咔唑,同时还原6,12-二硝基衍生物在相似的反应条件下,伴随着后者化合物的脱氮氢化为6,12-未取代的吲哚[3,2-b]咔唑。已证明仅在C-2处发生6,12-二硝基衍生物的甲酰化,这些化合物的溴化反应在吲哚[3,2-b]咔唑支架的C-2和C-8处都发生了。此外,已经通过与S-和N-亲核试剂反应改性了6,12-二硝基取代的吲哚[3,2-b]咔唑。值得注意的是,与吲哚或咔唑的钾盐仅引起一个硝基的取代不同,用硫醇钾处理6