Patent · US Active

Process for the preparation of 3-(3-chloro-1H-pyrazol-1-yl)pyridine

US9249122B1 · kind B1 · utility

20Cited by

34References

4Claims

0Family size

Inventors

Qiang Yang · Ellicott City, US
Beth Lorsbach · Indianapolis, US
Xiaoyong Li · Midland, US
Gary Roth · Midland, US
David E. Podhorez · Midland, US

Key dates

Filing date	Oct 17, 2014
Grant date	Feb 2, 2016
Priority date	—
Expiry date	Oct 17, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D401/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

3-(3-Chloro-1H-pyrazol-1-yl)pyridine is prepared by cyclizing 3-hydrazinopyridine•dihydrochloride with acrylonitrile to provide 1-(pyridin-3-yl)-4,5-dihydro-1H-pyrazol-3-amine, by oxidizing to provide 3-(3-amino-1H-pyrazol-1-yl)pyridine, and by converting the amino group to a chloro group by a Sandmeyer reaction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.