Abstract
An efficient solution-phase parallel synthesis of alkylated guanidines from commercial thioisocyanates and amines is described. In the first step, a thioisocyanate reacts with one equivalent of ammonia or a primary or secondary amine to give a thiourea intermediate. The latter is S-alkylated with n-dodecyl bromide resulting in the corresponding thiouronium bromide. Finally, the reaction of the thiouronium salt with a second equivalent of ammonia or a primary amine yields an alkylated guanidine. All three synthetic steps are easily combined in a one-pot high-yielding procedure with a simple work-up. Ca. 250 guanidine derivatives with high structural and functional diversity were synthesized by the developed method. 35 representatives reported in this study were fully characterized.
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Bogolubsky, A.V., Grishchenko, A., Pipko, S.E. et al. A solution-phase parallel synthesis of alkylated guanidines from thioisocyanates and amines. Mol Divers 17, 471–477 (2013). https://doi.org/10.1007/s11030-013-9444-z
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DOI: https://doi.org/10.1007/s11030-013-9444-z