Process for the preparation of nitroguanidine derivatives

Details Process for the preparation of nitroguanidine derivatives Process for the preparation of nitroguanidine derivatives

C - Chemistry, Metallurgy

07

D

C07D 413/06 (2006.01) C07D 213/61 (2006.01) C07D 213/89 (2006.01) C07D 277/32 (2006.01) C07D 307/14 (2006.01)

Patent

CA 2321678

A process for the production of a compound of formula (I), wherein R1 is hydrogen or C1-C4-alkyl; R2 is hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C2-C6- alkinyl, C3-C6-cycloalkyl or a radical -CH2B; A is an unsubstituted or mono- to penta-substituted aromatic or non-aromatic, monocyclic or bicyclic heterocyclic radical; and B is phenyl, 3-pyridyl or thiazolyl, which are optionally substituted by one to three substituents, is described; characterised in that a compound of formula (II), wherein R1, R2 and A have the same significances as in formula (I), and X is O or S; is hydrolysed with a strong acid. The compounds of formula (I) are suitable for the preparation of pesticides. The intermediates (II) are claimed.

L'invention concerne un procédé de production d'un composé de formule (I), dans laquelle R¿1? représente hydrogène ou alkyle C¿1?-C¿4?; R¿2? représente hydrogène, alkyle C¿1?-C¿6?, alkényle C¿2?-C¿6?, alkinyle C¿2?-C¿6?, cylcoalkyle C¿3?-C¿6?, ou un radical -CH¿2?B; A représente un radical non substitué ou monosubstitué à pentasubstitué, aromatique ou non aromatique, monocyclique, bicyclique, ou hétérocyclique; et B représente phényle, 3-pyridyle ou thiazolyle, lesquels sont éventuellement substitués par un à trois substituants. Selon ce procédé de production, un composé de formule (II), dans laquelle R¿1?, R¿2?, et A sont tels que dans la formule (I), et X représente O ou S, est hydrolysé à l'aide d'un acide fort. Les composés de formule (I) peuvent être utilisés pour préparer des pesticides. L'invention concerne également les produits intermédiaires de formule (II).

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