Abstract
Herein, we report a CuH-catalyzed asymmetric desymmetrization of prochiral cyclopentane-1,3-diones to access cyclic 3-hydroxy ketones having an all-carbon quaternary center with high diastereoselectivity via hydrosilylation using PMHS as an inexpensive hydride source. This reaction displays high functional group tolerance including reducible alkyne, alkene, and ester groups with a broad substrate scope. The importance of chiral cyclic 3-hydroxy ketone building blocks was also demonstrated through the synthesis of (-)-estrone, the toxicodenane E core, and fused indoles.
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