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。
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