Synthesis of N 1 ‐substituted coumarino[4,3‐c] pyrazoles

3‐Acyl‐4‐hydroxy‐2‐oxo‐2 H ‐chromen derivatives 1a‐d were condensed with (7‐hydroxy‐2‐oxo‐2 H ‐chromen‐4‐yl)‐acetic acid hydrazide 2 , (4‐methyl‐2‐oxo‐2 H ‐chromen‐7‐yloxy)‐acetic acid hydrazide 3 , and (7‐hydrazinocarbonylmethoxy‐2‐oxo‐2 H ‐chromen‐4‐yl)‐acetic acid hydrazide 4 , to give corresponding 3‐alkyl‐1‐[2‐(7‐hydroxy‐2‐oxo‐2 H ‐chromeno‐4‐yl)‐acetyl]‐1 H ‐chromeno[4,3‐ c ]pyrazole‐4‐one 5a‐d , 3‐alkyl‐1‐[2‐(4‐methyl‐2‐oxo‐2 H ‐chromeno‐7‐yloxy)‐acetyl]‐1 H ‐chromeno[4,3‐ c ]pyrazole‐4‐one 6a‐d , and 1‐{4‐[(3‐alkyl‐1 H ‐chromeno[4,3‐ c ]pyrazole‐4‐one‐1‐yl)‐carbonylmethyl]‐2‐oxo‐2 H ‐chromen‐7‐yloxy‐acetyl}‐3‐alkyl‐1 H ‐chromeno[4,3‐ c ]pyrazole‐4‐one 7a‐d.