Twelve title compounds (IVa-I) were synthesised by two different methods. The iust method involved the reaction of 4-methyl-7-coumarin-oxyacetyl hydrazine (0 and corresponding, ethyl-2)-<Uoxo butyi'at -2-aryl hydrazones (11), while the second method involved the diazo-coupling of l-{4-methyl-coumarin-7yl)-oxyacetyl-3-methyl-pyrazolin-S-one (UI) with different substituted phenyl diazonium chlorides. The structures of 1-(4-methyl·-coumarin-7yl)-oxyacety1-3-methyl-4(substituted phenyl hydrazono/azo)-pyrazolin-S-ones (IVa-I) have been assigned on the basis of IR and PMR spectroscopy. The obtained data indicate that these compounds exist in hydrazone form instead of tautomeric keto-azo or enol-azo forms. The compounds are relatively non-toxic except one and are eNS stimulants.
R AGARWAL ,R K SATSANGI ,S S TIWARI ,
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