Keyume, Ablajan published the artcileConvenient DABCO-catalyzed one-pot synthesis of multi-substituted pyrano[2,3-c]pyrazole dicarboxylates, Name: 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, the publication is Tetrahedron (2014), 70(26), 3976-3980, database is CAplus.
An efficient and simple one-pot synthesis was developed for preparation of functionalized multi-substituted 2,4-dihydro-pyrano[2,3-c]pyrazole dicarboxylates from β-keto esters, hydrazine, di-Me acetylenedicarboxylate and malononitrile in EtOH. This four-component one-pot reaction carried out in the presence of DABCO catalyst showed advantages over a one-pot three-component method in its simple procedure, high yield and low toxicity. The structures of the compounds were established on the basis of the spectroscopic data and confirmed by single crystal x-ray diffraction anal. of Me 6-amino-5-cyano-4-methoxycarbonylmethyl-3-methyl-2,4-dihydropyrano[2,3-c]pyrazole dicarboxylate.
Tetrahedron published new progress about 14580-22-4. 14580-22-4 belongs to pyrazoles-derivatives, auxiliary class Organic Pigment, name is 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone, and the molecular formula is C10H9ClN2O, Name: 1-(2-Chlorophenyl)-3-methyl-5-pyrazolone.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics