Intramolecular fusion reactions of a p-terphenylene-bridged NiII porphyrin dimer gave syn- and anti-doubly heptagon-fused NiII porphyrin dimers, a spiro-pentagon-bridged NiII chlorin dimer and a doub...
Supported Palladium‐Catalyzed Tandem Synthesis of 2‐(Alkylamino/amino)‐3‐arylquinazolin‐4(3H)‐ones Employing CO Source
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An efficient tandem addition and intramolecular aminocarbonylative cyclization has been developed for the synthesis of various 2-(benzyl/alkylamino)-3-arylquinazolin-4(3H)-one derivatives. This approach has been successfully extended for the synthesis of 2-amino-3-phenylquinazolin-4(3H)-one derivatives under ammonia and CO surrogate conditions.
Herein, we demonstrated heterogeneous and recyclable polystyrene-supported palladium (Pd@PS) nanoparticles (NPs) catalyzed tandem addition and intramolecular aminocarbonylative cyclization approach for the synthesis of potentially bioactive 2-(alkylamino/amino)-3-arylquinazolin-4(3H)-one analogues from 2-iodophenylcarbodiimides employing amines as nucleophiles and oxalic acid as an ex-situ CO alternative. Various cyclic/acyclic primary and secondary amines were employed and selectively produced substituted 2-(alkylamino)-3-arylquinazolin-4(3H)-ones in good to excellent yields. In addition, we extended the developed strategy to fix two ammonium carbamate and oxalic acid as gaseous NH3 and CO sources respectively, for the synthesis of 2-amino-3-arylquinazolin-4(3H)-one derivatives. Furthermore, gram scale applicability, diverse substrate scope and high recyclability of the Pd@PS catalyst were the major achievements of the developed protocol.Zum Volltext
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