Process for the preparation of a 3(2H)-pyridazinone-4- substituted amino 5-chloro derivative
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United States of America Patent
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Oct 5, 2004
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N/A
app pub date -
Feb 9, 2001
filing date -
Jun 5, 1998
priority date (Note) -
Expired
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Abstract
The invention relates to novel processes for the preparation of 5-chloro-4-{3-[N-[2-(3,4-dimethoxyphenyl)-ethyl]-N-methylamino]-propylamino-3(2H) pyridazinone of formula (I) and the pharmaceutically acceptable acid addition salts thereof. An important feature of the invention is using 3,4,5-trichloropyridazone as starting substance of the synthesis.
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