Zinc(II) promoted conversion of aryltriazenes to aryl iodides and aryl nitriles
摘要:
Aryltriazenes react with zinc perchlorate/zinc cyanide to produces arylnitriles and react with zinc iodide to produce aryliodides. The reaction mechanism involves aryl radicals that have been trapped by addition to propenenitriles in a good preparative Meerwein arylation process. (C) 2001 Elsevier Science Ltd. All rights reserved.
A practical approach involving decarboxylative arylation of cinnamic acids using aryl triazenes has been developed to accomplish the synthesis of stilbenes. The method employs easily accessible starting materials and features broad substrate scope and functional group tolerance.
1-Aryltriazenes in the Suzuki, Heck, and Sonogashira Reactions in Imidazolium-ILs, with [BMIM(SO<sub>3</sub>H)][OTf] or Sc(OTf)<sub>3</sub>as Promoter, and Pd(OAc)<sub>2</sub>or NiCl<sub>2</sub>·glyme as Catalyst
作者:Suraj M. Sutar、Hemantkumar M. Savanur、Shruti S. Malunavar、Pavankumar Prabhala、Rajesh G. Kalkhambkar、Kenneth K. Laali
DOI:10.1002/ejoc.201901070
日期:2019.9.22
surrogates for aryldiazonium, 1‐aryltriazenes are readily unmasked with [BMIM(SO3H)][OTf] or Sc(OTf)3 and enter into cross‐coupling in widely available imidazolium‐ILs as solvent. The scope of this chemistry in the Suzuki, Heck, and Sonogashirareactions is explored. The reactions give good isolated yields, employing either Pd or Ni as catalyst and thus widening the scope of the protocol.
Palladium-Catalyzed Direct C2 Arylation of<i>N</i>-Substituted Indoles with 1-Aryltriazenes
作者:Can Liu、Tao Miao、Lei Zhang、Pinhua Li、Yicheng Zhang、Lei Wang
DOI:10.1002/asia.201402274
日期:2014.9
A novel and efficient palladium‐catalyzed C2 arylation of N‐substituted indoles with 1‐aryltriazenes for the synthesis of 2‐arylindoles was developed. In the presence of BF3⋅OEt2 and palladium(II) acetate (Pd(OAc)2), N‐substituted indoles reacted with 1‐aryltriazenes in N,N‐dimethylacetamide (DMAC) to afford the corresponding aryl–indole‐type products in good to excellent yields.
Palladium-Catalyzed Carbonylative Synthesis of Amides from Aryltriazenes under Additive-Free Conditions
作者:Zhiping Yin、Zechao Wang、Xiao-Feng Wu
DOI:10.1002/ejoc.201700784
日期:2017.7.25
An interesting palladium-catalyzedcarbonylativesynthesis of amides from aryltriazenes has been developed. By using Pd(MeCN2)Cl2 as the catalyst precursor under CO pressure via N2 extrusion/CO insertion sequence, broad range of aryltriazenes were transformed into the corresponding amides in good yields with excellent functional groups tolerance. Remarkably, no additives such as acid or phosphine ligand
Protein Modification via Mild Photochemical Isomerization of Triazenes to Release Aryl Diazonium Ions
作者:Garrett J. Davis、Julia A. Townsend、Madeline G. Morrow、Mohamed Hamie、Abigail J. Shepard、Chih-Chieh Hsieh、Michael T. Marty、John C. Jewett
DOI:10.1021/acs.bioconjchem.1c00459
日期:2021.11.17
that can be activated to release aryl diazonium ions for labeling of proteins using light. These probes show marked bench stability at room temperature and can be photoisomerized via low-intensity UVA irradiation at physiological pH. Upon isomerization, the triazenes are rendered more basic and readily protonate to release reactive aryl diazonium ions. It was discovered that the intensity and duration