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.
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.
The cross-couplingreactions of 3,6-dihalopyridazines with triaryl- or triheteroarylbismuthcompounds were performed under palladium catalysis. The reaction was highly chemoselective, affording functionalized aryl- or heteroarylpyridazinyl chlorides in moderate to good yields.
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。