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- Epimerization of lactone 8 to 9 has been described in this reference
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- Lactone 1a was also obtained from the unprotected 3β-hydroxy analog of enone 14 by treatment with t-butyl isocyanide/TiCl4,15 which afforded the corresponding nitrile analog to 15. The remaining steps were as described for the 3β-OTBDMS steroid
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