Johnson, Matthew P. published the artcileAzo dienophiles. Diels-Alder reactions of 4-phenyl-1,2,4-triazole-3,5-dione and 5-phenylpyrazol-3-one with functionalized dienes, Recommanded Product: 5-Phenyl-1H-pyrazol-3(2H)-one, the main research area is Diels Alder phenyltriazoledione phenylpyrazolone diene; triazoledione phenyl Diels Alder diene; pyrazolone phenyl Diels Alder diene; regioselectivity Diels Alder phenylpyrazolone acetoxybutadiene.
The title triazoledione (I) underwent Diels-Alder reactions with a variety of dienes. E.g., reaction of [ICH2C(:CH2)]2 with I in CH2Cl2 at -50° for 15 min then -20° overnight gave 60% adduct II (R = R3 = iodo, R1R2 = bond) (III). Reduction of III with a Zn-Cu couple gave 97% II (RR1 = R2R3 = bond) which in turn reacted with a variety of dienophiles, including I, in a tandem Diels-Alder reaction. 5-Phenylpyrazol-3-one, generated in situ by oxidation of the corresponding pyrazolinone with Pb(OAc)4, also underwent a variety of Diels-Alder reactions, including regioselective reaction with AcOCH:CHCH:CH2 in CH2Cl2 to give 67% pyrazolopyridazine IV.
Journal of the Chemical Society, Perkin Transactions 12: Organic and Bio-Organic Chemistry published new progress about Diels-Alder reaction. 27412-71-1 belongs to class pyrazoles-derivatives, name is 5-Phenyl-1H-pyrazol-3(2H)-one, and the molecular formula is C9H8N2O, Recommanded Product: 5-Phenyl-1H-pyrazol-3(2H)-one.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics