Synthesis of a series of diaminobenzo[f]- and diaminobenzo[h]pyrimido[4,5-b]quinolines as 5-deaza tetracyclic nonclassical antifolates

Recent Progress in Synthetic Chemistry and Biological Activities of Pyrimido[ 4,5-b] Quinoline Derivatives (Part III)

Abstract:

Amongst heterocyclic compounds, quinoline and pyrimidine are advantaged scaffolds that appear as significant assembly motifs for the development of new drug entities. Moreover, quinolinepyrimidine- inspired hybrids have a number of biological characteristics that are known. In addition, many pyrimido[4,5-b]quinoline ring systems (PyQs4,5-b), specifically concerning medicinal chemistry, have been reported over the past decade. The synthesis of (PyQs4,5-b) using barbituric acid, thiobarbituric acid, pyrimidine, and their derivatives is presented in this review. The preparation of PyQs4,5-b was clarified through the following chemical reactions: Friedländer, Vilsmeier-Haack formylation, Hantzsch-like reaction, and one-pot three-component reaction.

4-Chloro-2,2-disubstituted Chromen-3-carboxaldehyde: Synthesis of some Fused Polycyclic Heterocycles as Anti-inflammatory, Analgesic, Anticonvulsant, and Antiparkinsonian Agents

Some new aldazino 4, pyrazolo 5, thieno 8, and thiooxopyrimidino chromenes 10 were prepared via reaction of the corresponding beta-chlorocarboxaldehyde 3 with hydrazine hydrate, mercaptoacetic acid, and thiourea, respectively. Wherever, 4-chlorochromene derivatives 2 along with 4-chlorochromen-3-carboxaldehyde derivatives 3 were prepared from the corresponding ketone 1 with Vilsmeier-Haack reagent. Some of the new products showed good anti-inflammatory, analgesic, anticonvulsant, and antiparkinsonian activities comparable to indomethacin, diclofenace, carbamazepine, and benztropine.