Tetrahedron Letters p. 6267 - 6270 (1998)
Update date:2022-08-05
Topics:
Batey, Robert A.
Santhakumar
Yoshina-Ishii, Chiaki
Taylor, Scott D.
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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Doi:10.1016/S0040-4020(98)00491-8
(1998)Doi:10.1016/S0040-4039(98)01422-1
(1998)Doi:10.1016/S0008-6215(97)10101-X
(1998)Doi:10.1007/BF01897874
(1969)Doi:10.1007/PL00013476
(1998)Doi:10.1016/0022-328X(96)06340-1
(1996)
