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
Copper‐Promoted O‐Arylation of the Phenol Side Chain of Tyrosine Using Triarylbismuthines
作者:Adrien Le Roch、Martin Hébert、Alexandre Gagnon
DOI:10.1002/ejoc.202000790
日期:2020.9.7
for the O‐arylation of the sidechain of tyrosine usingtriarylbismuthreagents is reported. The reaction is performed in dichloromethane under oxygen at 50 °C in the presence of pyridine, is promoted by copper diacetate, shows excellent scope and functional group tolerance, and retains the integrity of the chiral center. The reactivity of other amino acids possessing a nucleophilic sidechain under these
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.
Copper‐Promoted N‐Arylation of the Imidazole Side Chain of Protected Histidine by Using Triarylbismuth Reagents
作者:Hwai‐Chien Chan、Bianca Bueno、Adrien Le Roch、Alexandre Gagnon
DOI:10.1002/chem.202102186
日期:2021.9.20
The N-arylation of the sidechain of histidine by using triarylbismuthines is reported. The reaction is promoted by copper(II) acetate in dichloromethane at 40 °C under oxygen in the presence of diisopropylethylamine and 1,10-phenanthroline and allows the transfer of aryl groups with substituents at any position of the aromatic ring. The reaction shows excellent functional group tolerance and is applicable
报道了使用三芳基铋对组氨酸侧链进行 N-芳基化。在二异丙基乙胺和 1,10-菲咯啉的存在下,在 40 °C 的二氯甲烷中,乙酸铜 (II) 促进了该反应,并允许在芳环的任何位置具有取代基的芳基转移。该反应显示出优异的官能团耐受性,适用于组氨酸位于 N 端的二肽。在组氨酸占据 C 末端的二肽中观察到组氨酸引导的主链 NH 芳基化。
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。