209979-33-9Relevant academic research and scientific papers
A mild method for the synthesis of bis-pyrazolo[3,4-b:4′,3′-e]pyridine derivatives
Qiu, Rui,Qiao, Shujia,Peng, Boyu,Long, Jiajia,Yin, Guodong
, p. 3884 - 3888 (2018)
A mild and efficient method for the synthesis of bispyrazolo[3,4-b:4′,3′-e]pyridines from 5-aminopyrazoles and aromatic aldehydes using an inexpensive FeCl3 catalyst is reported. The reaction temperature was reduced from 220–250 °C to 130 °C compared to conventional methods. A large proportion of the products precipitated directly from the mixture at room temperature. Aliphatic and α,β-unsaturated aldehydes selectively resulted in formation of the corresponding 1H-pyrazolo[3,4-b]pyridine derivatives. A possible domino reaction mechanism was also proposed. Several aryl alkynyl groups were introduced to these tricyclic molecules via the Sonogashira coupling reaction.
Novel dipyrazolopyridine derivatives as deep blue emitters for polymer based organic light emitting diodes
Gondek,Nizio?,Danel,Jarosz,Gasiorski,Kityk
, p. 610 - 613 (2012)
Paper reports synthesis and spectroscopic properties of four newly synthesized dipyrazolo[3,4-b; 3′,4′-e]pyridine (DPP) derivatives. The spectroscopic studies are supplemented by quantum-chemical calculations using DFT/TDDFT/PCM method at the B3LYP/6-31+G
