Ionic Liquid Promoted Diazenylation of <i>N</i>-Heterocyclic Compounds with Aryltriazenes under Mild Conditions
作者:Dawei Cao、Yonghong Zhang、Chenjiang Liu、Bin Wang、Yadong Sun、Ablimit Abdukadera、Haiyan Hu、Qiang Liu
DOI:10.1021/acs.orglett.6b00605
日期:2016.5.6
aryltriazenes using Brønsted ionicliquid as a promoter has been developed for the first time. Many N-heterocyclic azo compounds were synthesized in good to excellent yields at roomtemperature under an open atmosphere. Notably, the promoter 1,3-bis(4-sulfobutyl)-1H-imidazol-3-ium hydrogen sulfate could be conveniently recycled and reused with the same efficacies for at least four cycles.
A new and efficient approach adopting copper-catalyzed cross-coupling of sulfonyl hydrazides with aryltriazenes has been developed to synthesize aryl sulfones using Brønsted acidic ionic liquid as promoter under ambient conditions. The process employs stable and easy to handle reacting partners, and is endowed with broad substrate scope.
Boron Trifluoride Induced Palladium-Catalyzed Cross-Coupling Reaction of 1-Aryltriazenes with Areneboronic Acids
作者:Tomoyuki Saeki、Eun-Cheol Son、Kohei Tamao
DOI:10.1021/ol036436b
日期:2004.2.1
[reaction: see text] Aryltriazenes are directly coupled with areneboronic acids in the presence of a catalytic amount of Pd(2)(dba)(3) and P(tBu)(3) together with 1 equiv of BF(3).OEt(2) in DME to afford the corresponding biaryl products in up to 98% yield. A carbonylative cross-couplingreaction under a carbon monoxide atmosphere is also found to give the corresponding diaryl ketone with a similar
valuable molecules requires a multistep sequence. Therefore, a simple, one-step protocol to access libraries of polyaromatic indole scaffolds is highly desirable. Herein we describe the direct synthesis of polysubstituted indolo[2,1-a]isoquinoline analogues via a double C–H annulation cascade using triazene as an internally cleavable directing group. Evidence from HRMS and theoretical calculations suggests
Comparison of the Thermal Stabilities of Diazonium Salts and Their Corresponding Triazenes
作者:Christiane Schotten、Samy K. Leprevost、Low Ming Yong、Colan E. Hughes、Kenneth D. M. Harris、Duncan L. Browne
DOI:10.1021/acs.oprd.0c00162
日期:2020.10.16
range of diazonium salts and their corresponding triazenes have been prepared in order to directly compare their relative thermal stabilities (via initial decomposition temperature) from differential scanning calorimetry (DSC) data. A structure–stability relationship has been explored to investigate trends in stability, depending on the aromatic substituent and the structure of the secondary amine component