Process for producing pyrido[1,2-a] pyrimidine derivative
申请人:WAKO PURE CHEMICAL INDUSTRIES LTD
公开号:EP0385634A2
公开(公告)日:1990-09-05
3-Tetrazolylpyrido[1,2-a]pyrimidin-4-ones of formula
useful as an antiallergy agent are produced by reacting a cyano derivative of pyrido[1,2-a]pyrimidin-4-one compound with (i) hydrazoic acid, followed by hydrolysis or with (ii) a salt of hydrazoic acid, reacting the resulting product with an acid or a base, followed by hydrolysis.