A modular synthesis of highly substituted imidazolium salts.

[摘要]：A versatile and modular one-pot method for the prepn. of differently substituted sym. and unsym. imidazolium salts is reported, and 19 examples are given. In the key step, readily available formamidines and a-halo ketones are coupled to give imidazolium salts, followed by imidazolium salt formation by acylation-induced elimination. For many substitution patterns of the imidazolium salt products, this efficient strategy compares favorably with well-known processes in terms of yield, ease of synthesis, and robustness.

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