AbstractA series of novel thiazine derivatives featuring axial chirality in both (R) and (S) configurations were successfully synthesized by N‐heterocyclic carbene (NHC)‐catalyzed enantioselective [3 + 3] annulations, and their potential as anti‐plant virus agents against potato virus Y (PVY) was evaluated. Biological activity results demonstrated that most of these chiral thiazine derivatives exhibited significant activities against PVY. Notably, compound (S)‐3g displayed a remarkable 58% inactivation effect against PVY at a concentration of 500 μg/mL, slightly surpassing the effectiveness of Ningnanmycin (NNM) at 57%. Additionally, (S)‐3g exhibited curative activity of 57%, which is superior to NNM (53%). Molecular docking studies revealed preliminary insights into the distinct biological properties of the two different enantiomers, (R) or (S)‐3g against PVY, wherein single enantiomer (S)‐3g formed a more stable interaction with PVY‐CP, as indicated by its lower binding free energy (−41.18 kcal/mol) compared to (R)‐3g (−36.9 kcal/mol). The findings in this study with a new class of axially chiral thiazine derivatives shall inspire further development of chiral heterocycles as potential drug candidates for the protection of plant virus infections.
摘要 通过N-杂环碳烯(NHC)催化的对映选择性[3 + 3]环化反应,成功合成了一系列具有轴向手性的(R)和(S)构型的新型噻嗪衍生物,并评估了它们作为抗马铃薯病毒Y(PVY)的植物病毒制剂的潜力。生物活性结果表明,这些手性噻嗪衍生物大多对 PVY 具有显著的活性。值得注意的是,在浓度为 500 μg/mL 时,化合物 (S)-3g 对 PVY 的灭活效果达到了 58%,略高于宁南霉素(NNM)的 57%。此外,(S)-3g 的治疗活性为 57%,优于宁南霉素(53%)。分子对接研究初步揭示了(R)或(S)-3g这两种不同对映体对PVY的不同生物学特性,其中单一对映体(S)-3g与PVY-CP形成了更稳定的相互作用,其结合自由能(-41.18 kcal/mol)低于(R)-3g(-36.9 kcal/mol)。这项关于一类新的轴向手性噻嗪衍生物的研究结果将激励人们进一步开发手性杂环,作为保护植物病毒感染的潜在候选药物。