威斯特法倫-萊特雷重排反應(Westphalen-Lettré rearrangement)指膽甾烷-3β,5α,6β-三醇二乙酸酯用乙酸酐和硫酸處理時,失去一分子水,在C10-C11間生成雙鍵,並且C10連接的甲基(C19)遷移至C5。[1][2] [3]
反應在過量硫酸存在時對甾類是一級反應。[4] 反應機理可能為首先生成相應的硫酸酯,並在 C5 生成碳正離子,然後再發生重排。
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