503269-27-0Relevant academic research and scientific papers
Facile method for the synthesis of pyrazolo[3,4-b]-pyrido[4,3-d]- pyrimidine-4-ones via a tandem aza-wittig reaction
Wang, Tao,Zheng, Cai Hua,Liu, Shu,He, Hong Wu
experimental part, p. 3386 - 3398 (2009/12/09)
Fifteen novel pyrazolo[3,4-b]-pyrido[4,3-d]-pyrimidine-4-ones (7a-o) were designed and have been successfully synthesized via tandem aza-Wittig and annulation reactions of the corresponding iminophosphorances 5, phenylisocyanate, and substituted phenols in 60-77% isolated yields. Their structures were clearly verified by infrared (IR), 1H NMR, electron impact-mass spectrometry (EI-MS), and elemental analysis. The results of a preliminary bioassay indicated that some compounds possess inhibition activities against the root of Brassica napus (rape) and Echinochloa crusgalli (barnyard grass) at a dosage of 100mg/L and 10mg/L.
A novel and facile synthesis of pyrazolo [3,4-b]pyridines
Zhao, Wei Guang,Li, Zheng Ming,Yuan, De Kai
, p. 454 - 455 (2007/10/03)
Pyrazolo[3,4-b]pyridines have been obtained by the condensation of 5-amino-4-cyanopyrazole, readily available by the reaction of dithioacetals with substituted hydrazines, with β-ketoesters or β-diketone in the presence of tin(IV) chloride at reflux temperature in dry toluene.
