A practical intramolecular C–H functionalization reaction of N-aryl enamines has been carried out with molecular iodine (I2) as the sole oxidant in the presence of copper iodide (CuI). The efficient and versatile synthetic method described here is compatible with both N-heteroaryl and N-aryl substituted enamines and produces diverse imidazo[1,2-a]pyridine and indole derivatives via I2-mediated oxidative
在碘化铜(CuI)存在下,以分子碘(I 2)为唯一氧化剂,进行了N-芳基烯胺的分子内C–H官能化反应。本文所述的高效且通用的合成方法与N-杂芳基和N-芳基取代的烯胺兼容,并通过I 2生成各种咪唑并[1,2- a ]吡啶和吲哚衍生物介导的氧化性C–N和C–C键的形成。这种无配体的C–H官能化方法也可以与粗制烯胺一起使用,这可以直接从芳胺和酮(或炔烃)直接合成产物,而无需纯化烯胺中间体。
Synthesis of 1<i>H</i>-Indole-2,3-dicarboxylates via Rhodium-Catalyzed C–H Annulation of Arylhydrazines with Maleates
作者:Sheng Zhang、He Li、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acs.joc.0c01727
日期:2020.10.2
This work describes a one-step synthesis of 1H-indole-2,3-dicarboxylates through C–Hactivation. Rhodium-catalyzed tandem C–Hactivation and annulation of 2-acetyl-1-phenylhydrazines with maleates proceeded smoothly in the presence of additive NaOAc and oxidant Ag2CO3 and produced the corresponding indole derivatives, 1H-indole-2,3-dicarboxylates, in satisfactory to good yields. A variety of useful
这项工作描述了通过C–H活化的1 H-吲哚-2,3-二羧酸酯的一步合成。在添加剂NaOAc和氧化剂Ag 2 CO 3的存在下,铑催化的串联C–H活化和2-乙酰基-1-苯基肼与马来酸酯的环合反应顺利进行,并产生了相应的吲哚衍生物1 H-吲哚-2,3-二羧酸盐,令人满意的好收率。苯环上可耐受各种有用的官能团,包括卤素原子(F,Cl,Br和I)和甲氧羰基。
Synthesis of benzofused 1,4-azaborinols via [4 + 2] annulation strategy and its application in indole synthesis
作者:Murugan Chinnapattu、Kulathu Iyer Sathiyanarayanan、Pravin S. Iyer
DOI:10.1039/c5ra05082k
日期:——
The first general synthesis of benzofused 1,4-azaborinols via [4 + 2] annulation strategy and its application in indole synthesis.
通过[4 + 2]环化策略合成苯并1,4-氮硼醇的第一个通用合成方法及其在吲哚合成中的应用。
10.1039/d4ob01177e
作者:Sarmah, Debasish、Choudhury, Anup、Bora, Utpal
DOI:10.1039/d4ob01177e
日期:——
A system utilizing palladium(II)-PEG has been devised for the intramolecular Heck cyclization of N-vinyl and N-allyl-2-haloanilines. The synthesis of a variety of indoles, including 2,3-diester substituted ones and 3-methyl indoles, has been accomplished using this catalytic system. The N-vinyl starting materials are obtained by the aza-Michael addition of 2-haloanilines with alkynecarboxylate esters
设计了一种利用钯( II )-PEG 的系统,用于N-乙烯基和N-烯丙基-2-卤代苯胺的分子内 Heck 环化。利用该催化体系完成了多种吲哚的合成,包括2,3-二酯取代吲哚和3-甲基吲哚。 N-乙烯基起始材料通过2-卤代苯胺与炔烃羧酸酯的氮杂-迈克尔加成获得,其在环化后产生酯取代的吲哚。相反, N-烯丙基-2-卤代苯胺产生3-甲基化吲哚作为主要产物。该系统的高活性归功于Pd纳米颗粒的原位生成。
Shi, Zhuangzhi; Zhang, Chun; Li, Si, Angewandte Chemie - International Edition, 2009, vol. 48, p. 4572 - 4576