Abstract
A short and efficient synthesis of the 25-hydroxy Windaus-Grundmann ketone from the Inhoffen-Lythgoe diol is described (seven steps, 70% overall). The most relevant feature of the synthesis is the preparation of the Wittig reagent 3 from cheap and commercially available starting materials. Pure 3 can be obtained in multigram quantities for achieving clean and efficient Wittig reactions. (C) 2000 Elsevier Science Ltd.
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