Isomers of monothioureas, 2a–2d, derived from the reaction of disubstituted benzoyl isothiocyanate and dibenzylamine were synthesised and characterised by using elementary analysis CHNS and IR, 1H NMR, and 13C NMR spectroscopies. The compounds were screened for their in vitro antibacterial activity by using selected Gram-positive bacteria, and moderate inhibition activity was displayed for compound 2b with the value of inhibition zone 11 ± 0.8 mm at a concentration of 50 mg/ml. The outcomes of Lipinski’s rule of five assessment appeared to be in agreement with all compounds as they adhered to most of the rules, in which they can be preliminarily classified as active drug-like. The frontier molecular orbitals (HOMO and LUMO) for halogen-substituted 3,4-dichloro (2a) and 3,4-difluoro (2b) were also determined by applying the computational method of density functional theory (DFT) to determine their relationship as a molecular descriptor in antibacterial activities. The value of LUMO energy for compound 2b (1.8229 eV) is lower than that of compound 2a (1.8492 eV) which indicates higher antibacterial activities.
由双取代苯甲酰异
硫氰酸酯和
二苄胺反应所得的单
硫脲异构体2a-2d,通过基本分析CHNS和IR、1H NMR和13C NMR光谱学进行合成和表征。这些化合物被筛选用于对选择的革兰氏阳性菌的体外抗菌活性测试,其中化合物2b在50 mg/ml浓度下显示出抑制区直径为11±0.8 mm的中等抑制活性。 Lipinski的五项规则评估的结果似乎与所有化合物一致,因为它们遵循了大多数规则,可以初步分类为活性药物类似物。通过应用密度泛函理论(DFT)的计算方法,确定了卤代3,4-二
氯(2a)和3,4-二
氟(2b)的前沿分子轨道(HOMO和LUMO),以确定它们作为抗菌活性的分子描述符之间的关系。化合物2b的LUMO能量值(1.8229 eV)低于化合物2a(1.8492 eV),表明其具有更高的抗菌活性。