Process of preparing o-carbamoyl compounds in the presence...

C - Chemistry – Metallurgy – 07 – C

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C07C 237/10 (2006.01)

Patent

CA 2541303

A process for preparing O-carbamoyl aminoalcohols represented by Formula(I) wherein: n is an integer from 0 and 5; R1, R2, R3 and R4 are individually selected from the group consisting of hydrogen, alkyl, cycloalkyl, substituted or unsubstituted aryl and arylalkyl the aryl portion of which may be unsubstituted or substituted; R5 and R6 are individually selected from the group consisting of hydrogen, alkyl or arylalkyl the aryl portion of which may be unsubstituted or substituted; or R1 and R5 together with the carbon and nitrogen to which they are attached may form an unfused or fused heterocyclic ring having from 4 to 10 members, comprising reacting an aminoalcohol represented by Formula (II) wherein n, R1, R2, R3, R4, R5 and R6 are as defined; with a cyanate and an excess of an acid in an organic solvent medium.

La présente invention concerne un procédé permettant l'élaboration d'alcools aminés d'O-carbamoyl représentés par la formule (I). Dans cette formule, n est un entier de 0 à 5. R¿1?, R¿2?, R¿3? et R¿4? sont individuellement choisis dans le groupe constitué de l'hydrogène, des alkyles, des cycloalkyles, des aryles et des arylalkyles, éventuellement substitués, la substitution de l'aryle y étant également facultative. R¿5? et R¿6? sont individuellement choisis dans le groupe constitué de l'hydrogène, des alkyles ou des arylalkyles, la substitution de l'aryle y étant également facultative. Mais il est également possible que R¿1? et R¿5? forment ensemble avec le carbone et l'azote auxquels ils sont attachés un cycle hétérocycle éventuellement fusionné de 10 segments. Pour ce procédé, on prend un alcool aminé représenté par la formule (II), et on le fait réagir avec un cyanate, et un milieu à solvant organique contenant un excès d'acide. Dans la formule (II), les n, R¿1?, R¿2?, R¿3?, R¿4?, R¿5? et R¿6? sont tels que précédemment définis.

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