Process for the production of N-[3-(3-cyanopyrazolo[1,5-a]pyrimidin-7-yl)p-henyl]-N-ethylacetamide (zaleplon)
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United States of America Patent
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Issued Date -
Aug 25, 2005
app pub date -
Feb 25, 2005
filing date -
Jun 12, 2001
priority date (Note) -
Abandoned
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Abstract
The present invention provides a process for the production of N-[3-(3-cyanopyrazolo[1,5-a]pyrimidin-7-yl)phenyl]-N-ethylacetamide (zaleplon), an active ingredient that is approved for the treatment of insomnia. The process involves reacting N-[3-[3-(dimethylamino)-1-oxo-2-p-ropenyl]phenyl]-N-ethylacetamide or a salt thereof with 3-amino-4-cyanopyrazole or a salt thereof under acidic conditions in a reaction medium comprising a mixture of water and a water-miscible organic compound.
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