related to the cardenolide and bufadienolide skeletons were readily available through highly diastereo-/enantioselective Diels–Alder reactions calling for high pressure or Lewis acid activation. Moreover, in the presence of (R)or (S)-carvone as chiral dienophile, the Diels–Alder reaction took place under chemodivergent parallel kinetic resolution control. Based on experimental and DFT studies, reasonable
摘要 – 通过需要高压或
路易斯酸活化的高度非对映-/对映选择性 Diels-Alder 反应,可以很容易地获得与 cardenolide 和 bufadienolide 骨架密切相关的天然、非天然和 ent-14β-羟基雄烷衍
生物。此外,在 (R) 或 (S)-
香芹酮作为手性亲双烯体存在的情况下,Diels-Alder 反应在
化学发散平行动力学拆分控制下发生。基于实验和 DFT 研究,假设了合理的机制见解来解释观察到的凹/凸和内/外选择性形成不同的 Diels-Alder 和 Diels-Alder-Michael 加合物。