Barnes & Thornburg LLP
Process for the preparation of 3-(3-chloro-1H-pyrazol-1-yl)pyridine
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.
C
C07D
inventional
Gary Beth David E. Xiaoyong Qiang
Roth Lorsbach Podhorez Li Yang