In an attempt to find a new class antibacterial agents, a series of biscoumarins (1–4) and dihydropyrans (5–13) were successfully prepared. The molecular structures of four representative compounds, that is, 4, 5, 8 and 12 were confirmed by single crystal X-ray diffraction study. These synthesized compounds were screened for their antibacterial activity in vitro against Staphylococcus aureus (S. aureus ATCC 29213), methicillin-resistant S. aureus (MRSA XJ 75302), vancomycin-intermediate S. aureus (Mu50 ATCC 700699), USA 300 (Los Angeles County clone, LAC), Staphylococcus epidermidis (S. epidermidis ATCC 14990), methicillin-resistant S. epidermidis (MRSE XJ 75284) and Escherichia coli (E. coli ATCC 25922). Additionally, there are two classical intramolecular O–H···O hydrogen bonds (HBs) in biscoumarins 1–4 and the corresponding HB energies were further performed with the density functional theory (DFT) [B3LYP/6-31G*] method.
为了寻找新型抗菌剂,成功合成了一系列双
香豆素(1–4)和二氢
吡喃(5–13)。通过单晶X射线衍射研究确认了四个代表性化合物的分子结构,即4、5、8和12。这些合成的化合物在体外进行了抗菌活性筛选,针对的菌株包括
金黄色葡萄球菌(S. aureus A
TCC 29213)、耐
甲氧西林金黄色葡萄球菌(MRSA XJ 75302)、
万古霉素中介
金黄色葡萄球菌(Mu50 A
TCC 700699)、美国300群体(洛杉矶县克隆,
LAC)、表皮葡萄球菌(S. epidermidis A
TCC 14990)、耐
甲氧西林表皮葡萄球菌(MR
SE XJ 75284)和大肠杆菌(E. coli A
TCC 25922)。此外,双
香豆素1–4中存在两个经典的分子内O–H···O氢键(HB),并进一步利用密度泛函理论(DFT)[B3LYP/6-31G*]方法计算了相应的氢键能量。