An Efficient Synthesis of Imidazolinium Salts Using Vinyl Sulfonium Salts
摘要:
The synthesis of imidazolinium salts from the reaction of formamidines and (2-bromoethyl)diphenylsulfonium triflate is described. A variety of symmetrical and unsymmetrical imidazolinium Inflate salts were synthesized in high yield in short reaction times under mild conditions. Aromatic and aliphatic N-substituents work well. The reaction is proposed to proceed via generation of a vinyl sulfonium salt Intermediate frorr the bromoethylsulfonium triflate.
Preparation of imidazolinium salts by the Pd-catalyzed reduction of thioureas with triethylsilane and trialkylsilyl triflate
作者:Takehiko Matsumura、Masahisa Nakada
DOI:10.1016/j.tetlet.2014.01.022
日期:2014.2
A Pd-catalyzed method for the preparation of imidazoliniumsalts from the corresponding thioureas that could then be used for the synthesis of imidazolium and amidinium salts is described. This method has great potential because all the required reagents are readily available and thioureas are safely converted to their corresponding precursors of NHCs under mild conditions.