氢键辅助的亚硝基芳烃的邻位选择性C(sp 2)-H氨基化和随后的α-C(sp 3)-H脂肪族胺的官能化在无金属条件下实现。亚硝基芳烃和2-羟基-C-亚硝基化合物与N-杂环的环化分别提供了相对于广泛的生物学相关的环稠合的苯并咪唑和结构上新颖的多环咪唑的简便过量。发现在卤代亚硝基芳烃的C(sp 2)–H胺化过程中,亲核芳香族氢取代(S N ArH)比经典S N Ar反应更可取。
Greener synthesis using hydrogen peroxide in ethyl acetate of alicyclic ring-fused benzimidazoles and anti-tumour benzimidazolequinones
作者:Martin Sweeney、Michael Gurry、Lee-Ann J. Keane、Fawaz Aldabbagh
DOI:10.1016/j.tetlet.2017.07.102
日期:2017.9
Environmentally-friendly and cost effective hydrogenperoxide in ethylacetate was used to prepare in high yields pyrrolo[1,2-a]benzimidazoles from commercial o-(pyrrolidin-1-yl)anilines without the requirement for organic-aqueous extraction and chromatography. Six, seven and eight membered ring-fused analogues were similarly obtained in high yields with methanesulfonic acid required for the pyrido[1
使用环境友好且经济高效的乙酸乙酯中的过氧化氢,无需有机水萃取和色谱法即可从商业邻-(吡咯烷基-1-基)苯胺制备高收率的吡咯并[1,2- a ]苯并咪唑。用吡啶[1,2- a ]苯并咪唑所需的甲磺酸,以高收率相似地获得了六,七和八元环稠合的类似物。通过3,6-二甲氧基-2-(环氨基)苯胺的环化,可以高产率获得抗肿瘤苯并咪唑醌衍生物。