highly selective C-2 difluoromethylation of indole derivatives was developed by using sodium difluoromethylsulfinate (HCF2SO2Na) as the source of difluoromethyl groups and a Cu(II) complex as the catalyst. Various substrates were well tolerated in this transformation and the desired products were obtained in moderate to good yields. Moreover, the late-stage C-2 difluoromethylation of bioactive molecules
通过使用二氟甲基亚磺酸钠(HCF 2 SO 2 Na)作为二氟甲基的来源和Cu(II)络合物作为催化剂,开发了一种新颖且高效的吲哚衍生物高选择性C-2二氟甲基化方法。在这种转化中,各种底物都具有良好的耐受性,并且以中等至良好的产率获得了所需的产物。此外,以高收率实现了含有吲哚环的生物活性分子的后期C-2二氟甲基化。通常,该反应具有出色的官能团相容性,广泛的底物范围和出色的C-2选择性。
Ruthenium(II)-Catalyzed Regioselective C-8 Hydroxylation of 1,2,3,4-Tetrahydroquinolines
Ru(II)-catalyzed chelation-assisted highly regioselective C8-hydroxylation of 1,2,3,4-tretrahydroquinolines has been developed. Various 1,2,3,4-tetrahydroquinolines underwent smooth C8–H hydroxylation with cheap and safe K2S2O8 as the oxidant and oxygen source to furnish the corresponding products in good to excellent yields with high tolerance of the functional groups. The choice of a readily installable
已经开发了Ru(II)催化的1,2,3,4-四氢喹啉的螯合辅助的高区域选择性C8-羟基化反应。各种1,2,3,4-四氢喹啉经过顺畅的C8–H羟基化反应,并以廉价且安全的K 2 S 2 O 8作为氧化剂和氧源,以高收率和高官能度耐受性提供了相应的产品。选择易于安装和拆卸的N-嘧啶导向基团是催化的关键。机理研究表明六元钌循环中间体参与了催化循环。该方法还可以扩展到其他(杂)芳烃CH键的直接羟基化反应。
Ru(<scp>ii</scp>)-Catalyzed C7-acyloxylation of indolines with carboxylic acids
Ruthenium-catalyzed site-selective C7-acyloxyation of indolines with carboxylic acids is presented that can be oxidized to indoles with diverse functional groups.
Predictable site-selective functionalization: Promoter group assisted <i>para</i>-halogenation of <i>N</i>-substituted <b>(</b>hetero<b>)</b>aromatics under metal-free condition
SEAr (electrophilic aromatic substitution) type reaction is disclosed. SEAr type reaction has been utilized for the C5-bromination of indolines (para-selective) with N-bromosuccinimide under metal and additive-free conditions in good to excellent yields. The developed methodology is also applicable for iodination and challenging chlorination. The pyrimidyl group is identified as a reactivity tuner
本文公开了通过 S E Ar(亲电芳族取代)型反应对N-嘧啶基(杂)芳烃进行区域选择性对-C-H 卤化。S E Ar 型反应已用于二氢吲哚的 C5-溴化(对位选择性)与N-溴代琥珀酰亚胺在无金属和无添加剂的条件下具有良好至极好的收率。所开发的方法也适用于碘化和具有挑战性的氯化。嘧啶基被确定为反应性调节剂,它也控制区域选择性。本方法也适用于苯胺、吡啶、吲哚、羟吲哚、吡唑、四氢喹啉、异喹啉和咔唑的选择性卤化。Fukui 亲核性和自然电荷图等 DFT 研究也支持观察到的p-选择性。标题化合物后官能化为相应的芳基化、烯化和二卤化产物是通过一锅两步的方式实现的。还对药物/天然分子(哈明、依托考昔、可乐定和氯唑沙宗)进行了后期 C-H 溴化,以证明所开发方案的适用性。
A Chemistry for Incorporation of Selenium into DNA‐Encoded Libraries
simple selenation with limited atom economy and complicated reaction system. In this work, we designed benzoselenazolone as a novel bifunctional selenide reagent for both off‐ and on‐DNA C−H selenylation under rhodium(III) catalysis. We show that using benzoselenazolone allowed production of a series of selenylation products containing an adjacent aminoacyl group in a fast and efficient way, with high