ChemInform Abstract: One‐Pot Synthesis of 2H‐Phenanthro[9,10‐c]pyrazoles from Isoflavones by Two Dehydration Processes.

Abstract

One-Pot Synthesis of 2H-Phenanthro[9,10-c]pyrazoles from Isoflavones by Two Dehydration Processes. -The title compounds are synthesized via cyclocondensation of isoflavones and hydrazine hydrate to obtain 3,4-diaryl-pyrazole intermediates. Subsequent photocyclization and dehydration of these pyrazoles affords the target compounds in moderate to good overall yields. -(WANG, Q.; ZHANG*, Z.; DU, Z.; HUA, H.; CHEN, S.; Green Chem. 15 (2013) 4, 1048-1054, http://dx.doi.org/10.1039/c3gc40205c ; Sch. Chem. Chem. Eng., Shaanxi Norm. Univ., Xian, Shaanxi 710062, Peop. Rep. China; Eng.) -S. Karsten 30-138