意义 维生素 D (VitD) 是一组类固醇,已被证明是支持人类整体健康的重要分子。在结构上,C20 的修饰导致发现了具有广泛生物靶标的新型类似物。其中,钙泊三醇(Daivonex;LEO Pharma)已被证实可用于治疗自身免疫性皮肤病牛皮癣。这项工作涉及用于制备一系列 VitD 衍生物(包括卡泊三醇)的中间体的改进制备方法,以及卡泊三醇的制备方法。战略性的债券断开使 A 环和 CD 环的从头合成成为可能,而不是与半合成结合。
Dearomatization applications of I(III) reagents and some unusual reactivity amongst resorcinol derived cyclohexadienones
摘要:
The oxidative dearomatization of resorcinol derivatives, which are outfitted with a lactic acid derived chiral tether, and mitigated by hypervalent iodine derivatives of PhIO, affords stable chiral cyclohexadienones as useful building blocks for the construction of many highly functionalized chiral six and seven-membered ring systems. Herein, we report a multitude of remarkable and unexpected diastereoselective transformations stemming from these cyclohexadienone adducts. Published by Elsevier Ltd.