One-Pot Reactions for Synthesis of 2,5-Substituted Tetrazoles from Aryldiazonium Salts and Amidines
摘要:
One-pot sequential reactions of aryldiazonium salts with amidines followed by the treatment of I-2/KI under basic conditions provide 2,5-disubstituted tetrazoles in moderate to excellent yields. This one-pot synthesis has several advantages such as mild reaction conditions, short reaction time, convenient workup, and high yields, making this methodology practical.
Efficient synthesis of 2,5-disubstituted tetrazoles via the Cu2O-catalyzed aerobic oxidative direct cross-coupling of N–H free tetrazoles with boronic acids
作者:Yu Li、Lian-Xun Gao、Fu-She Han
DOI:10.1039/c2cc17894j
日期:——
We present a new protocol that allows for the synthesis of 2,5-disubstituted tetrazolesvia the direct coupling of NâH free tetrazoles and low toxic boronic acids in the presence of only a catalytic amount of Cu2O (5 mol%) as catalyst and 1 atm of environmentally benign O2 as oxidant, without the need for other additives. This method represents a simple, green, and atom-efficient synthesis of 2,5-disubstituted tetrazoles.
The Development of Copper-Catalyzed Aerobic Oxidative Coupling of H-Tetrazoles with Boronic Acids and an Insight into the Reaction Mechanism
作者:Chao-You Liu、Yu Li、Jin-Ying Ding、De-Wen Dong、Fu-She Han
DOI:10.1002/chem.201302857
日期:2014.2.17
The development of a highly efficient and practical protocol for the direct CN coupling of H‐tetrazole and boronic acid was presented. A careful and patient optimization of a variety of reaction parameters revealed that this conventionally challenge reaction could indeed proceed efficiently in a very simple system, that is, just by stirring the tetrazoles and boronic acids under oxygen in the presence