67029-84-9Relevant academic research and scientific papers
Substituent-Oriented Synthesis of Substituted Pyrazoles/Chromeno[3,2- c]pyrazoles via Sequential Reactions of Chromones/3-Chlorochromones and Tosylhydrazones
Dai, Tianzi,Li, Qunyi,Zhang, Xiaofei,Yang, Chunhao
, p. 5913 - 5921 (2019/05/10)
A facile and efficient synthetic strategy for the chemoselective synthesis of monocyclic/tricyclic-fused pyrazoles was developed, and it was oriented by different 3-position substituents (H or Cl) on the chromones. The reaction proceeded in a one-pot sequential way with a broad substrate scope and moderate to excellent yields.
Rhodium/chiral diene-catalyzed asymmetric 1,4-addition of arylboronic acids to chromones: A highly enantioselective pathway for accessing chiral flavanones
He, Qijie,Wang, Jun,So, Chau Ming,Hayashi, Tamio,Bian, Zhaoxiang
supporting information, p. 540 - 543 (2015/05/05)
Chromone has been noted to be one of the most challenging substrates in the asymmetric 1,4-addi-tion of α,β-unsaturated carbonyl compounds. By employing the rhodium complex associated with a chiral diene ligand, (R,R)-Ph-bod, the 1,4-addition of a variety of aryl-boronic acids was realized to give high yields of the corresponding flavanones with excellent enantioselectivities (≥97% ee, 99% ee for most substrates). Ring-opening side products, which would lead to erosion of product enantioselectivity, were not observed under the stated reaction conditions.
2,3-Unsubstituted chromones and their enaminone precursors as versatile reagents for the synthesis of fused pyridines
Iaroshenko, Viktor O.,Mkrtchyan, Satenik,Gevorgyan, Ashot,Miliutina, Mariia,Villinger, Alexander,Volochnyuk, Dmytro,Sosnovskikh, Vyacheslav Ya.,Langer, Peter
supporting information; experimental part, p. 890 - 894 (2012/02/02)
A divergent and regioselective approach to fused pyridines was developed through formal [3 + 3] cyclocondensations from simple 2,3-unsubstituted chromones or their enaminone precursors.
