| 摘要 |
<p>A process for the preparation of 6-piperidino-2,4-diaminopyrimidine 3-oxide, characterised in that, in a first stage, at least one of the two amine functional groups of a compound of formula (I): …<IMAGE>… in which X denotes halogen or an OH group, is protected by an addition reaction of an isocyanate of formula:… R-N=C=O… in which R denotes an alkyl group, to one of the amine groups of the compound of formula (I), in that the resulting urea derivative is then oxidised to convert the compound into the corresponding N-oxide, the N-oxide then being reacted with piperidine and then subjected to a reaction for removing the protective group(s) by treatment with an organic or inorganic base, and the new intermediate compounds.</p> |
