98700-48-2Relevant articles and documents
ν-Triazolines, XXIV-Pyrazolecarbaldehydes from 5-Amino-4,5-dihydro-4-methylene-ν-triazoles and Sydnones
Destro, Riccardo,Erba, Emanuela,Forti, Luciana,Pocar, Donato,Scarcella, Daniela
, p. 1377 - 1388 (2007/10/02)
The sydnones 1a-c react with the 4,5-dihydro-ν-triazoles 2a-c by long refluxing at 110-140 deg C affording via non-isolable adducts with elimination of CO2 and N2 and rearrangement a mixture of 4,5-dihydropyrazoles 3a-c, 3-pyrazolecarbaldehyde anils 4a-d, and 3-pyrazolecarbaldehydes 5a-c.Compounds 3 can be deaminated to give 4 which can be hydrolyzed to yield the 3-pyrazolecarbaldehydes 5. - The sydnones 6a,b react similarey with 2a to give a mixture of 4-pyrazolecarbaldehyde anils 7a,b and 4-pyrazolecarbaldehydes 8a,b.The structural assignments are based on spectroscopic and X-ray diffraction data.