Rhodium(III)-Catalyzed Oxidative Allylic C–H Indolylation via Nucleophilic Cyclization
作者:Jiaqiong Sun、Kuan Wang、Peiyuan Wang、Guangfan Zheng、Xingwei Li
DOI:10.1021/acs.orglett.9b01553
日期:2019.6.21
Reported herein is a mild synthesis of 3-allylindoles via Rh(III)-catalyzed allylic C–H activation of olefins and coupling with o-alkynylanilines. The reaction proceeded via initial nucleophilic cyclization of o-alkynylanilines followed by oxidative coupling with allylic C–H bonds via an η3-allyl intermediate.
[reaction: see text]. A new approach to carbazoles and benzannulated carbazoles by means of intramolecular dehydro Diels-Alder reactions of ynamides is reported. By using this approach, carbazoles and benzo[b]-, tetrahydrobenzo[b]-, naphtho[1,2-b]-, naphtho[2,1-b]-, and dibenzo[a,c]carbazoles have been prepared in moderate-to-good yields.
Copper-catalyzed trifluoromethylazidation and rearrangement of aniline-linked 1,7-enynes: access to CF<sub>3</sub>-substituted azaspirocyclic dihydroquinolin-2-ones and furoindolines
作者:Liu-Zhu Yu、Yin Wei、Min Shi
DOI:10.1039/c7cc04748g
日期:——
A set of reactions involving copper-catalyzedtrifluoromethylazidation and then rearrangement of aniline-linked 1,7-enynes with the relatively poorly reactive Togni reagent I and TMSN3 was developed, and provided facile access to structurally diverse and useful CF3-substituted azaspirocyclic dihydroquinolin-2-ones bearing two adjacent quaternary carbon centers. We were also able to obtain these products
Boron Trichloride‐Mediated Synthesis of Indoles
<i>via</i>
the Aminoboration of Alkynes
作者:Jiahang Lv、Binlin Zhao、Li Liu、Ying Han、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/adsc.201800509
日期:2018.11.5
We describe an efficient catalyst‐ and metal‐free aminoboration of alkynes to 3‐borylated indoles using one of the least expensive boron sources, BCl3. The major dichloro(indolyl)borane products can be used for the in situ construction of useful 3‐Bpin indoles. This simple and mild method provides a novel and efficient approach for the synthesis of various 3‐borylated indoles with high regioselectivity
A new approach to carbazoles and benzannulated carbazoles by means of intramolecular dehydro Diels–Alder of ynamides is reported. N-(o-Ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides were prepared in a few steps starting from o-iodoaniline. Thermal cycloaddition of N-(o-ethynyl)aryl ynamides and N-(o-ethynyl) arylynamides affords carbazoles and benzannulated and heteroannulated carbazoles in moderate-to-good