Abstract
AbstractMethyl‐ and phenylhydrazines react with 2‐(diphenylacetyl)‐1,3‐indandione (1) to yield respectively the 1‐(methylhydrazone) and the 1‐(phenylhydrazone) of 2‐(diphenylacetyl)‐1,3‐indandione (2a and 2b). In comparison, acetic and benzoic acid hydrazides react with 1 to give respectively the α‐(acetylhydrazone) and the α‐(benzoylhydrazone) of 2‐(diphenylacetyl)‐1,3‐indandione (3a and 3b). Cyclization of 2a and 2b gives 2,3‐disubstituted indeno[1,2‐c]pyrazol‐4(2H)‐ones (7a and 7b). Cyclization of 3a and 3b, followed by methylation, gives 1‐methyl‐ and 2‐methyl‐3‐(diphenylmethyl)indeno[1,2‐c]pyrazol‐4(1 and 2H)‐ones (9a and 9b). 2‐Isovaleryl‐1,3‐indandione reacts with phenylhydrazine to give directly 3‐isobutyl‐1‐phenylindeno[1,2‐c]‐pyrazol‐4(1H)‐one (10).
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