Rearrangement of 23-oxospirostanes to the 22-oxo-23-spiroketal isomers promoted by Lewis acids—X-ray crystal structure of (23R,25S)-3β-acetoxy-16β,23:23,26-diepoxy-5β-cholestan-22-one

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Abstract

Both 25R and 25S 23-oxospirostanes undergo rearrangement to the 22-oxo-23-spiroketal isomers promoted by Lewis acids. An X-ray crystal structure analysis of the rearranged product of 23-oxosarsasapogenin acetate confirmed the R configuration at the new spiro carbon atom.

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