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An efficient new protocol for the formation of unsymmetrical tri- and tetrasubstituted ureas

โœ Scribed by Robert A. Batey; V. Santhakumar; Chiaki Yoshina-Ishii; Scott D. Taylor

Publisher
Elsevier Science
Year
1998
Tongue
French
Weight
241 KB
Volume
39
Category
Article
ISSN
0040-4039

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โœฆ Synopsis

A new method for producing unsymmetrical, tetrasubstituted ureas from N, N'carbonyldiimidazole (CDI) is presented. Carbamoyl imidazolium salts are prepared from the reaction of CDI with a secondary amine, followed by alkylation with MeI. Secondary amines add with ease to imidazolium salts at room temperature to give unsymmetrical, tetrasubstituted ureas in excellent yields.

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โœ Eve Bridgeman; Nicholas C. O. Tomkinson ๐Ÿ“‚ Article ๐Ÿ“… 2006 ๐Ÿ› John Wiley and Sons โš– 23 KB ๐Ÿ‘ 2 views

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An efficient protocol for the formation
An efficient protocol for the formation of aminothiatriazoles from thiocarbamoylimidazolium salts
โœ Marisa G Ponzo; Ghotas Evindar; Robert A Batey ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› Elsevier Science ๐ŸŒ French โš– 137 KB

A new protocol for the formation of substituted aminothiatriazoles from thiocarbamoylimidazolium salts is outlined. Thiocarbamoylimidazolium salts are synthesized from the corresponding amines by treatment with thiocarbonyldiimidazole (TCDI) followed by methylation with iodomethane. Thiocarbamoylimi