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.
N 2-Aryl-N 1-alkylformamidines are conveniently and rapidly prepared by the reaction of an aromatic amine with ethyl N-cyanoformimidate to give the N 2-aryl-N 1-cyanoformamidine. Addition of this intermediate to an excess of an alkyl- or dialkylamine results in the formation of the title compounds in high yield and satisfactory purity. A mechanism for this reaction is proposed and discussed.
N 2-芳基-N 1-烷基甲脒是通过芳香胺与 N-氰基甲酰胺亚胺乙酯反应生成 N 2-芳基-N 1-氰基甲脒而方便快速地制备的。将这种中间体加入过量的烷基胺或二烷基胺中,就能以高产率和令人满意的纯度生成标题化合物。本文提出并讨论了这一反应的机理。
Mimin,Y.V. et al., Journal of general chemistry of the USSR, 1962, vol. 32, p. 3795 - 3798