Synthetic Studies Towards Milbemycin β3. Rapid Construction of a Model Spiroketal Subunit Using the Intramolecular Silyl Modified Sakurai (ISMS) Methodology

Abstract
The ISMS condensation between allyl silane 3 and ortholactone 13 smoothly leads, after oxidative cleavage and stereoselective reduction, to spiroketal 2b, a model for the subunit present in milbemycin β3.

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