Synthesis, characterization (IR, 1H, 13C & 31P NMR), fungicidal, herbicidal and molecular docking evaluation of steroid phosphorus compounds

Phosphorus containing steroidal derivatives such as 3β-oxo-[diazaphosphalidine-2’-one] stigmast-5-ene and 3β-oxo-[diazaphosphalidine-2’-one] stigmast-5,22-diene were designed, synthesized and characterized using spectroscopic techniques (IR,1H,13C &31P NMR, HRMS) and elemental analysis. The fungicidal and herbicidal studies of the compounds were performed and the experimental outcomes showed that compound 4 showed a good fungicidal activity against mycelium growth of fungi, while in the case of herbicidal activity, both compounds show a moderate activity compared to the commercial drug; Atrazine. The binding free energy of active compound 4 to the receptor named 4-Hydroxyphenylpyruvate dioxygenase (HPPD) was calculated using the molecular docking study. The HPPD is one of the most effective targets of plants for the herbicide study.