Preparation of Fused Tetracyclic Quinazolinones by Combinations of Aza-Wittig Methodologies and Cu<sup>I</sup>-Catalysed Heteroarylation Processes
作者:Juan Antonio Bleda、Pilar M. Fresneda、Raul Orenes、Pedro Molina
DOI:10.1002/ejoc.200900082
日期:2009.5
A number of linear quinazolinonesfused to five-membered rings – benzimidazo[2,1-b]quinazolinones 8 and benzothiazolo[2,3-b]quinazolinones 10 – have been prepared from iminophosphoranes 4, derived from N-substituted o-azidobenzamides by a combination of the aza-Wittigmethodology and Cu I -catalysed heteroarylation. The presence of a nitrogen functionality in the N-aryl substituent of 4 promotes heterocyclization
Copper-catalyzed cascade synthesis of benzimidazoquinazoline derivatives under mild condition
作者:Shan Xu、Juyou Lu、Hua Fu
DOI:10.1039/c1cc10383k
日期:——
A convenient and efficient copper-catalyzedcascade method has been developed for the synthesis of benzimidazoquinazoline derivatives via reactions of readily available substituted 2-(2-halophenyl)benzoimidazoles with amidines or guanidine under mild conditions (even at room temperature).
2-c] quinazoline. A series of “Aza”-type derivatives were designed, synthesized and evaluated for their antifungalactivity against six plant fungi in vitro. Among all derivatives, compounds A-0, B-1 and B-2 showed significant antifungalactivity against B. cinerea with the EC50 values of 2.72 μg/mL, 5.90 μg/mL and 4.00 μg/mL, respectively. Compound A-2 had the highest activity against M. oryzae with
Nickel-Catalyzed Aerobic Oxidative Isocyanide Insertion: Access to Benzimidazoquinazoline Derivatives via a Sequential Double Annulation Cascade (SDAC) Strategy
作者:Anand H. Shinde、Sagar Arepally、Mayur D. Baravkar、Duddu S. Sharada
DOI:10.1021/acs.joc.6b02423
日期:2017.1.6
An efficient protocol for the synthesis of quinazoline derivatives through nickel-catalyzed ligand-/base-free oxidative isocyanide insertion underaerobicconditions with intramolecular bis-amine nucleophiles has been developed. A one-pot sequential double annulation cascade (SDAC) strategy involving an opening of isatoic anhydride and annulation to benzimidazole and further nickel-catalyzed intramolecular