Process for preparing a pharmaceutically active compound and for preparing its intermediate
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United States of America Patent
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Feb 20, 2007
Grant Date -
Mar 9, 2006
app pub date -
Oct 27, 2003
filing date -
Oct 31, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention discloses a method for preparing the intermediate 2-(2,3-dichlorophenyl)-2-(aminoguanidine)acetonitrile of formula (II), which comprises the reaction of 2,3-dichlorobenzoyl cyanide with aminoguanidine bicarbonate in non-aqueous medium in the presence of methanesulphonic acid, which produces good yields and short reaction times.Said intermediate is useful for preparing 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine of formula (I). The invention also relates to a method for preparing (I) with high purity ##STR00001##
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