Pyrido-pyrimido-thiadiazinones: green synthesis, molecular docking studies and biological investigation as obesity inhibitors
Ferid Yaccoubi, Mohamed El‐Naggar, Fathy M. Abdelrazek, Sobhi M. Gomha, M. Farghaly, Tariq Z. Abolibda, Lobna Abo Ali, Aboubakr H. Abdelmonsef
Abstract
Obesity is a global public health concern brought on by a combination of excessive dietary intake, inactivity and genetic predisposition. Pyridopyrimidines have received considerable interest in the development of obesity and diabetes. Mannich reaction was applied on 2-thioxo-pyridopyrimidinone derivative with a variety of aromatic and heterocyclic aromatic amines and formaldehyde by grinding at 25°C in the presence of HCl to obtain 18 fused thiadiazinones and two bis-fused thiadiazinone derivatives. Additionally, in silico docking was performed to investigate the mode of actions of the 20 synthesized compounds against fat mass and obesity-associated (FTO) protein. The ligand molecules are nicely docked to the target FTO with binding energies (ΔGbind) ranging from −11.6 to −8.0 kcal/mol. Electrostatic potential map of semiempirical optimized compound 16 was performed using Gaussian 03. Interestingly, two bis-fused thiadiazinone derivatives showed marked amelioration of adiposity in the high-fat diet model especially in hepatic and adipose tissues.