5‐(Cyano)dibenzothiophenium Triflate: A Sulfur‐Based Reagent for Electrophilic Cyanation and Cyanocyclizations
作者:Xiangdong Li、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.201904557
日期:2019.7.8
and its reactivity as electrophilic cyanation reagent evaluated. The scalable preparation, easy handling and broad substrate scope of the electrophilic cyanation promoted by 9, which includes amines, thiols, silyl enol ethers, alkenes, electron rich (hetero)arenes and polyaromatic hydrocarbons, illustrate the synthetic potential of this reagent. Importantly, Lewis acid activation of the reagent is not
报道了通过用Tf 2 O活化二苯并[b,d]噻吩-5-氧化物并随后与TMSCN反应制备的5-(氰基)二苯并噻吩三氟甲磺酸盐9的合成,并评估了其作为亲电氰化试剂的反应性。9促进了亲电氰化的可扩展制备,易于处理和广泛的底物范围其中包括胺,硫醇,甲硅烷基烯醇醚,烯烃,富电子(杂)芳烃和聚芳烃,说明了该试剂的合成潜力。重要的是,转移过程不需要试剂的路易斯酸活化。我们在此另外报告了仿生氰基环化级联反应,该反应不是典型的亲电子氰化试剂所促进的,证明了9具有引发挑战性转化的优异能力。