41808-52-0Relevant articles and documents
Synthesis and cyclic GMP phosphodiesterase inhibitory activity of a series of 6-phenylpyrazolo[3,4-d]pyrimidones
Duma?tre, Bernard,Dodic, Nerina
, p. 1635 - 1644 (2007/10/03)
A series of 6-phenylpyrazolo[3,4-d]pyrimidones is described which are specific inhibitors of cGMP specific (type V) phosphodiesterase. Enzymatic and cellular activity as well as in vivo oral antihypertensive activity are evaluated. A n-propoxy group at the 2-position of the phenyl ring is necessary for activity. A series of products substituted at the 5-position in addition to the 2-n-propoxy was prepared and evaluated. This position can accommodate many unrelated groups. Amino derivatives were very potent but lacked metabolic stability. Substitution by carbon-linked small heterocycles provided both high levels of activity and stability. Cellular activity very often correlated with in vivo activity. Among the compounds, 1,3-dimethyl-6- (2-propoxy-5-methanesulfonamidophenyl)-1,5-dihydropyrazolo[3,4-d]pyrimidin- 4-one (38) and 1-ethyl-3-methyl-6-(2-propoxy-5-(4-methylthiazol-2-yl)phenyl)- 1,5-dihydropyrazolo[3,4-d]pyrimidin-4-one (59) displayed outstanding in vivo activities at 5 mg/kg/os and good metabolic stabilities.
