Nitrogen-containing heterocycles are undoubtedly one of the most important targets in organic chemistry. They are widely distributed in natural products and in pharmaceutical agents, and numerous studies for their chemistry ...

Heterocyclic compounds have a wide range of applications but are of particular interest in

medicinal chemistry and this improve the discovery and development of much heterocyclic

chemistry and methods. The ...

Interest in catalysis by palladium nanoparticles is increasing dramatically due to the
advantages offered by these “semi-heterogeneous catalysts” [1]. These advantages combine
the characteristics of heterogeneous ...

Pyrimido[4,5-b]indoles, fused tricyclic 6:5:6 compounds with three nitrogen atoms (2:1:0;
positions 1, 3, and 9, and bicyclic 5:6 analogues, pyrrolo[2,3-d]pyrimidines), are of interest
because of their extensive use ...

An efficient and convenient synthesis of new thiazino[2,3-b]quinoxaline derivatives has been developed by employing a one-pot cyclo-condensation of several α-haloketones and 3-aminoquinoxaline-2-thiol in acetic acid. A ...

An alternative approach to the synthesis of a series of new pyrimido[5′,4′:5,6][1,4]thiazino[2,3-b]quinoxaline derivatives is described. Reaction of 5‑bromo-2,4-dichloro-6-methylpyrimidine and 3‑aminoquinoxaline-2-thiol ...

Several derivatives of the novel fused seven-membered heterocyclic system of pyrimido[4,5-e]tetrazolo[5,1-b][1,3,4]thiadiazepine (5a–f) have been synthesized through the heterocyclization reaction of 2,4-dichloro-5-(chlo ...

2-Substituted-4-methyl-5,13-dihydropyrimido[4',5':5,6][1,4]thiazepino[2,3-b]quinoxalines

(7a-g), derivatives of a new heterocyclic system were synthesized through cyclocondensation of 2,4-dichloro-5-(chloromethyl) ...

Several new pyrimido[4,5-e]tetrazolo[5,1-b][1,3,4]thiadiazine derivatives have been synthesised through heterocyclisation of 5-bromo-4,6-dichloropyrimidine with sodium 1-amino-1H-tetrazole-5-thiolate via an S–N type Smiles ...