To effectively obtain the subject compound useful for an agrochemical industrially efficiently by reacting an aminoquinazolinone derivative with 3- ccyanopyridine.
A compound of formula I (R is H, a lower alkyl, etc.) or a compound of formula II (R2 and R3 are a lower alkyl or a lower alkoxy) is reacted with 3-cyanopyridine to give a 3-(3-pyridylmethylidenamino)-3,4- dihydro-2(1H)-quinazolinone derivative of formula III, which is isolated or not isolated and reduced to give the objective compound of formula IV. To be concrete, the compound of formula I or formula II is reacted with 3- cyanopyridine in an inert solvent in the presence of a metal production such as platinum oxide and an acid catalyst such as hydrochloric acid in a hydrogen atmosphere under normal pressure to 10kg/cm2 hydrogen pressure at room temperature to 100°C for several minutes to 48 hours. When the compound of formula III is isolated, preferably the isolated compound of formula III is reduced.
FURUYA TAKASHI
ABE NOBORU
SEO AKIRA
