Synthesis of new 4-(pyrimidin-4-yl)pyrazol-3-one derivatives Anna A. Sukhanova, Maxim I. Zuev, Mikhail A. Prezent, Alexey N. Proshin, Sergey V. Baranin, Yurii N. Bubnov Mendeleev Communications, 2019 New 4-(2-R-pyrimidin-4-yl)-5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-ones were obtained by reaction of difluoroboron chelate of 4-acetyl-5-hydroxy-3-methyl-1-phenyl-1H-pyrazole with guanidine and its derivatives.
Boron-chelate assisted synthesis of new bipyrazole derivatives Maxim A. Zuev, Anna A. Sukhanova, Alena G. Smola, Mikhail A. Prezent, Alexey N. Proshin, Sergey V. Baranin, Yurii N. Bubnov Mendeleev Communications, 2018 New 2H,3′H-3,4′-bipyrazol-3′-ones were obtained by reaction of hydrazines with difluoroboron chelate of 4-acetyl-5-hydroxy-3-methyl-1-phenyl-1H-pyrazole. Relative isoxazolyl pyrazolone derivative was synthesized from this chelate and hydroxylamine.
