Synthesis of 2-Substituted 3-Nitro-1,2-dihydropyridines by Heterocyclic Annulation reactions of a sec-Nitrodienamine with Aldehyde Compounds.

Synthesis of 2-substituted 3-nitro-1,2-dihydropyridines by heterocyclic annulation reactions of a sec-nitrodienamine with aldehyde compounds.

The reaction of a sec-nitrodienamine 3 with aldehyde compounds afforded 2-substituted 3-nitro-1,2-dihydropyridines 5, providing a heterocyclic annulation reaction.

Annulation Reactions of ( Trialkylsilyl ) Ketenes : Synthesis of Substituted

single-step synthesis of multi-component spirobarbiturates using ionic liquids and synthesis of substituted pyridine filled with catalysts supported on solid substrate

in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...

REACTIONS OF DIHYDROPYRIDINES WITH BENZYNE

Reactions of 1 ,Zdihydropyridines (la-c) and 1,4-dihydropyridines (2a-c) in the presence of benzyne (3) under thermal conditions, and in the case of (2c) under photochemical conditions, have been investigated. Benzyne acts as an oxidizing agent to convert dihydropyridine (la) and (2a) to the corresponding pyridine (4) or adds as a dienophile to (lb-c).

Novel synthesis of biologically active nitro heterocyclic compounds

Introduction A vast number of heterocyclic moieties are used in pharmaceutical research, agricultural science and drug discovery. Heterocyclic building blocks also have practical use as components in dyestuffs, antioxidants, copolymers, bases and ligands. Nitro heterocyclic compounds have diverse biological activity, antiinflammatory or vasodilator activity and structure activity relationship, ...