Copper‐Promoted N‐Arylation of the Indole Side Chain of Tryptophan Using Triarylbismuthines
作者:Adrien Le Roch、Hwai‐Chien Chan、Alexandre Gagnon
DOI:10.1002/ejoc.202000667
日期:2020.9.30
for the regioselective N‐arylation of the indole sidechain of tryptophan using triarylbismuth reagents as the arylating agent is reported. The reaction is catalyzed by copper(II) acetate in the presence of an organic base. The protocol allows the installation of electron rich or poor aryl groups with substituents at any position, shows excellent scope and functional group compatibility, and retains
The N-arylation of indoles, indazoles, pyrroles, and pyrazoles using highly functionalized trivalent arylbismuth reagents is reported. The reaction is promoted by a substoichiometric amount of copper acetate, and it tolerates a wide diversity of functional groups on the azole and the organobismuth reagent. The method is also applied to the N-arylation of tryptophan derivatives.
Synthesis of Highly Functionalized Triarylbismuthines by Functional Group Manipulation and Use in Palladium- and Copper-Catalyzed Arylation Reactions
作者:Martin Hébert、Pauline Petiot、Emeline Benoit、Julien Dansereau、Tabinda Ahmad、Adrien Le Roch、Xavier Ottenwaelder、Alexandre Gagnon
DOI:10.1021/acs.joc.6b00767
日期:2016.7.1
group tolerance. We report herein a detailed study on the preparation of highly functionalized triarylbismuth reagents by triple functional group manipulation and their use in palladium- and copper-catalyzed C-, N-, and O-arylation reactions.
by copper(II) acetate mediated O‐arylationreaction of phenols using trivalent organobismuthanes. The reaction is performed under simple conditions and tolerates a wide diversity of functional groups on the phenol and on the organobismuthreagent. Substoichiometric amounts of catalyst can be used by performing the reaction under an oxygen atmosphere. The N‐arylation of pyridones is also reported.
On the Copper-Promoted Backbone Arylation of Histidine-Containing Peptides Using Triarylbismuthines
作者:Alexandre Gagnon、Hwai-Chien Chan
DOI:10.1055/a-1786-6578
日期:2022.8
backbone arylation of histidine-containing peptides using triarylbismuth reagents. The reaction proceeds on the backbone NH of the aminoacid that precedes the histidine, the so-called n–1 position. The protocol is applicable to dipeptides where the histidine is located at the C-terminus and to tripeptides where the histidine occupies the central position. The transformation is promoted by copper(II) acetate
我们在此报告我们使用三芳基铋试剂对含组氨酸肽的组氨酸定向骨架芳基化的详细研究。反应在组氨酸之前的氨基酸主链 NH 上进行,即所谓的n–1 个位置。该方案适用于组氨酸位于 C 末端的二肽和组氨酸占据中心位置的三肽。乙酸铜 (II) 在 50 °C 氧气下在二氯甲烷中存在菲咯啉 (Phen) 和二异丙基乙胺的情况下促进转化。对于三芳基铋,观察到了极好的范围。在所有情况下,组氨酸的咪唑环都被三苯甲基保护以防止侧链芳基化。提出了一个类似 ATCUN 的模型来解释观察到的结果。