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1,3‐Dipolar cycloaddition reactions of nitrilimines with 1‐aroyl‐4,5‐dihydro‐3,4,4‐trimethyl‐5‐methylene‐1 H ‐pyrazoles. Synthesis of 6‐aroyl‐8,9,9‐trimethyl‐1,2,6,7‐tetrazaspiro[4.4]nona‐2,7‐dienes
Author(s) -
Papadopoulos Stelios,
StephanidouStephanatou Julia
Publication year - 1987
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570240203
Subject(s) - chemistry , cycloaddition , methylene , 1,3 dipolar cycloaddition , medicinal chemistry , organic chemistry , catalysis
From the 1,3‐dipolar cycloaddition reactions of 5‐methylene‐1 H ‐pyrazoles 3 with N ‐arylnitrilimines the novel spiro‐cycloadducts 4 were isolated, in addition to the corresponding 5‐(2‐aroylhydrazono‐1,1‐dimethylpropyl)‐1 H ‐pyrazoles 5. These pyrazoles 5 were the only products from the reactions of 3 with N ‐methylnitrilimine 2d. The chemical behaviour of the spiro‐cycloadducts 4 was also examined.