Process for producing 3-tetrazolyl pyrido[1,2-a]pyrimidine derivatives
申请人:Wako Pure Chemical Industries, Ltd.
公开号:US05081243A1
公开(公告)日:1992-01-14
3-Tetrazolylpyrido[1,2-a]pyrimidin-4-one derivatives 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.