Synthesis of Pyrido-annelated Diazepines, Oxazepines and Thiazepines.

The immense amount of research on benzodiazepines resulted in the synthesis of heterocycle-fused diazepine derivatives with potential pharmacological activity. Pyridoazepines are recognized to be active in the central nervous system and have a comparable activity to the well-known benzodiazepines. This makes the synthesis and the study of pyridodiazepines an important research topic.

Synthesis Of Pyrido-Annelated Seven-Membered N-Containing Heterocycles.

Pharmaceutical industry is struggling with a lack of potential drugs in the pipe line. However, there is still a great opportunity to elaborate interesting scaffolds for medicinal chemistry. Various scaffolds that hold promise are rarely described in the literature.

Straightforward entry to pyrido[2,3-d]pyrimidine-2,4(1H,3H)-diones and their ADME properties.

A straightforward synthesis of pyrido[2,3-d]pyrimidine-2,4(1H,3H)-diones was developed starting from 2-chloropyridine-3-carboxylic acid by esterification, nucleophilic aromatic substitution and amide formation in one step, and ring closure allowing their synthesis with two identical or two different group attached to nitrogen. The structural diversity of these [2,3-d]pyrimidine-2,4(1H,3H)-diones resulted in significant variation in the biopharmaceutical properties. This was reflected by the broad range in fasted state simulated intestinal fluid solubility values (12.