A ruthenium‐catalyzed direct C7 amidation of indoline CHbonds with sulfonyl azides was developed. This procedure allows the synthesis of a variety of 7‐amino‐substituted indolines, which are useful in pharmaceutical. The good functional tolerances, as well as the mild conditions, are prominent feature of this method.
Site-Selective C–H Functionalization of (Hetero)Arenes via Transient, Non-symmetric Iodanes
作者:Stacy C. Fosu、Chido M. Hambira、Andrew D. Chen、James R. Fuchs、David A. Nagib
DOI:10.1016/j.chempr.2018.11.007
日期:2019.2
A strategy for C–Hfunctionalization of arenes and heteroarenes has been developed to allow site-selective incorporation of various anions, including Cl, Br, OMs, OTs, and OTf. This approach is enabled by in situ generation of reactive, non-symmetric iodanes by combining anions and bench-stable PhI(OAc)2. The utility of this mechanism is demonstrated via para-selective chlorination of medicinally relevant
Ruthenium-catalyzed site-selective C7-acyloxyation of indolines with carboxylic acids is presented that can be oxidized to indoles with diverse functional groups.
铑催化的选择性C7-酰氧化反应将吲哚与羧酸进行作用,可氧化为具有多种功能基团的吲哚化合物。
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。
Rh(III)-catalyzed C−H alkylation of indolines with enones through conjugate addition and protonation pathway
作者:Hyunjung Oh、Jihye Park、Sang Hoon Han、Neeraj Kumar Mishra、Suk Hun Lee、Yongguk Oh、Mijin Jeon、Gyeong-Joo Seong、Ka Young Chung、In Su Kim
DOI:10.1016/j.tet.2017.06.052
日期:2017.8
The rhodium(III)-catalyzed C−H alkylations of indolines with enones and enals is described. This reaction can proceed through 1,4-conjugate addition and protonation process providing β-indolinic ketone compounds, which are known to be crucial scaffolds of biologically active compounds.