Intermediates for pyrazolyl acetic acid derivatives
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 23, 1997
Issued Date -
N/A
app pub date -
Nov 1, 1996
filing date -
Sep 7, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention discloses a novel process for the preparation of a compound of formula II ##STR1## wherein R.sub.1 is C.sub.1-5 alkyl, R.sub.2 is hydrogen or C.sub.1-5 alkyl, and R.sub.3 is optionally substituted phenyl, comprising the reaction of a 4-hydroxypyrazole of formula III ##STR2## wherein R.sub.1 and R.sub.2 are as defined for formula II, with a benzylhalide of formula IV Hal--CH.sub.2 --R.sub.3 (IV) wherein Hal is halogen, preferably bromine or chlorine, and R.sub.3 is as defined for formula II, in the presence of a base. The invention further comprises a novel process for the preparation of the 4-hydroxypyrazole of formula III. The compounds of formulae II and III are intermediates for highly effective systemic fungicides of the class of pyrazolyl acetic acid derivatives.
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C07D Class
- 0 % this patent is cited more than
- 28 Age