AbstractOxidative C‐2 olefination of indoles/pyrrole via rhodium(III)‐catalyzed direct CH bond activation is reported. Phenolic OH and aniline NH2 units were revealed to be effective chelating groups to activate the aryl CH bond. The reactions proceeded with excellent selectivity and high functional group tolerance, furnishing 2‐vinylindoles/2‐vinylpyrroles in good yields.magnified image
Palladium‐Catalyzed Primary Amine‐Directed Decarboxylative Annulation of
<i>α</i>
‐Oxocarboxylic Acids: Access to Indolo[1,2‐
<i>a</i>
]quinazolines
作者:Guangbin Jiang、Shoucai Wang、Jun Zhang、Jianwen Yu、Ziang Zhang、Fanghua Ji
DOI:10.1002/adsc.201900001
日期:2019.4.16
for the preparation of indolo[1,2‐a]quinazolines via palladium‐catalyzed decarboxylative annulation of indols with α‐oxocarboxylic acids has been realized by using primary amine as a directing group (DG). This transformation proceeds smoothly with exclusive regioselectivity and represents an one‐pot Dominosynthesis of indo‐lo[1,2‐a]quinazolines from α‐oxocarboxylic acids.
用于制备高效的协议吲哚并[1,2一]喹唑啉通过钯-催化的与indols的脱羧环α -oxocarboxylic酸已经通过使用伯胺作为定向基团(DG)实现。这种转化具有排他性区域选择性的顺利进行,代表了从α-氧代羧酸一锅多米诺合成吲哚[1,2- a ]喹唑啉的过程。
Palladium-catalyzed sequential acylation/annulation of indoles with acyl chlorides using primary amine as the directing group
作者:Guangbin Jiang、Guang Yang、Xinqiang Liu、Shoucai Wang、Fanghua Ji
DOI:10.1039/d0nj04406g
日期:——
An attractive and convenient strategy for the direct acylation/annulation of indoles has been developed using Pd(0) as an efficient catalyst. The main feature of this protocol is the use of acyl chlorides as the acylating agents with the primary amine as the directing group. A variety of indolo[1,2-a]quinoxalines were readily obtained in reasonable efficiency and satisfactory yields with good functional
使用Pd(0)作为有效催化剂,已经开发出了一种有吸引力且方便的吲哚直接酰化/环化的策略。该方案的主要特征是使用酰氯作为酰化剂,并以伯胺为导向基团。各种吲哚并[1,2- a ]喹喔啉可以以合理的效率和令人满意的收率获得,并且具有良好的官能团耐受性。在控制实验的基础上,提出了初步的催化机理。
Synthesis of Carboranylated Dihydropyrrolo[1,2-<i>a</i>]quinoxalines and Dihydroindolo[1,2-<i>a</i>]quinoxalines by BF<sub>3</sub>·OEt<sub>2</sub>-Catalyzed Heterocyclization of <i>C</i>-Formyl-<i>o</i>-carboranes and Investigation of Their Oxidation Stability
作者:Zhen-Zhen Sun、Pan Gao、Yong Yang、Tao Wang、Xiao-Jun Wu、You-Qing Wang
DOI:10.1021/acs.joc.3c02443
日期:2024.3.1
BF3·OEt2-catalyzed synthesis of carboranylated dihydropyrrolo[1,2-a]quinoxalines and dihydroindolo[1,2-a]quinoxalines in 30–99% yields is presented through the heterocyclization of various C-modified C-formyl-o-carboranes with 1-(2-aminophenyl)-pyrroles/indoles. A systematic comparative investigation of their oxidation stability in air confirmed that 4-carboranyl-4,5-dihydropyrrolo[1,2-a]quinoxaline had better
通过各种C-修饰的C-甲酰基-的杂环化,BF 3 ·OEt 2催化合成碳硼酰化二氢吡咯并[1,2- a ]喹喔啉和二氢吲哚并[1,2- a ]喹喔啉,产率30-99%邻碳硼烷与1-(2-氨基苯基)-吡咯/吲哚。对它们在空气中氧化稳定性的系统比较研究证实,4-碳硼基-4,5-二氢吡咯并[1,2- a ]喹喔啉比4-苯基类似物具有更好的稳定性。 N-乙酰基取代的碳硼酰化二氢吡咯并[1,2- a ]喹喔啉的笼式脱硼反应产生相应的7,8-硝基-碳硼烷铯盐。还实现了动力学拆分,以获得带有碳硼烷笼碳键合手性立体中心的光学纯碳硼酰化N-杂环支架。