EP0237289A3 — Pyrazolo [3,4-d] pyrimidine derivatives, their production and use
Assigned to Takeda Pharmaceutical Co Ltd · Expires 1988-07-27 · 38y expired
What this patent protects
Novel pyrazola[3,4-d]pyrimidine derivatives represented by the formula (I) wherein R¹ is an aryl or heteroaryl group which may be substi tuted; R² is a lower alkyl group; R³ and R⁴ are independently hydrogen or a lower alkyl group; R⁵ is hydrogen, a lower alkyl g…
USPTO Abstract
Novel pyrazola[3,4-d]pyrimidine derivatives represented by the formula (I) wherein R¹ is an aryl or heteroaryl group which may be substi tuted; R² is a lower alkyl group; R³ and R⁴ are independently hydrogen or a lower alkyl group; R⁵ is hydrogen, a lower alkyl group or a lower acyl group, the group R⁵ being attached at the 1- or 2- position of the pyrazole ring; Xis a lower alkylene group which may contain a hetero-atom; and the dotted line designates the presence of two double bonds in the pyrazole ring and their salts activate cerebral functions and metabolisms.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
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