Derivatives of furo(2,3-d) pyrazolo(3,4-b) pyridines

Abstract From the Canadian patent

New derivatives of furo2,3-dpyrazolo3,4-bpyridines useful as antiinflammatory agents, central nervous system depressants, and to increase the intra-cellular concentration of adenosine-3',5'-cyclic monophosphate have the general, formula, wherein R1 is hydrogen lower alkyl or phenyl-lower alkyl;, R2 is hydrogen or lower alkyl; R3 is lower alkyl phenyl, hydroxy or lower alkoxy; R4 is hydroxy lower alkoxy or, wherein R6 and R7 each is hydrogen lower alkyl or, phenyl-lower alkyl; and R5 is hydrogen lower alkyl or, phenyl.