Process for the preparation of zaleplon

Details Process for the preparation of zaleplon Process for the preparation of zaleplon

2006-06-06

2006-06-06

Kumar, Shailendra (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

Reexamination Certificate

active

07057041

ABSTRACT:
The invention relates to a process for the preparation of zaleplon (N-[3(3-cyanopyrazolo[1,5-a]pyrim-idin-7-yl)phenyl]-N-ethyl-accramide) in the reaction of 3-dimethylamino-1-(3-N-ethyl-N-acetylamirnophenyl)-2-propen-1-one with 3-aminopyrazole-4-carbonitrile, which comprises carrying out said reaction in an aqueous solution of formic acid at formic acid concentrations in the range of 20–80% (w/w). Zaleplon is useful as an anxiolytic, a sedactive and a skeletal muscle relaxant.

REFERENCES:
patent: 5714607 (1998-02-01), Padmanathan
patent: 6884888 (2005-04-01), Korodi et al.

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