A comparative study of enol aldehyde formation from betamethasone, dexamethasone, beclomethasone and related compounds under acidic and alkaline conditions
作者:Bin Chen、Min Li、Mingxiang Lin、Gilbert Tumambac、Abu Rustum
DOI:10.1016/j.steroids.2008.09.009
日期:2009.1
1,3-dihydroxyacetone side chain on their D-rings, such as betamethasone, dexamethasone, beclomethasone, and related compounds. The formation of enol aldehydes from these corticosteroids is via acid-catalyzed beta-elimination of water from the side chain, a process known as Mattox rearrangement. It was recently reported by our group that enol aldehydes could also be formed directly from the corresponding
烯醇醛是一组皮质类固醇的关键降解和代谢中间体,其 D 环上含有 1,3-二羟基丙酮侧链,例如倍他米松、地塞米松、倍氯米松和相关化合物。从这些皮质类固醇形成烯醇醛是通过酸催化β-消除侧链中的水,这一过程称为 Mattox 重排。我们小组最近报道,烯醇醛也可以直接从这些皮质类固醇的相应 17,21-二酯形成,但只能在碱性条件下形成,这被认为遵循原始 Mattox 重排的变异途径。在本文中,我们分别报告了这些结构相似的皮质类固醇(在原始酸性 Mattox 条件下)及其 17,21-二酯(在碱性 Mattox 变化条件下)形成烯醇醛的比较研究结果。一般而言,发现在两种条件下都会形成烯醇醛;然而,烯醇醛的 E-异构体和 Z-异构体的比例在每种情况下都不同。唯一的例外是在碱性条件下的倍氯米松 17,21-二酯,其中 HCl 从 9,11-位的竞争消除变得占主导地位。这些结果可以通过它们在 Mattox