Abstract
Aliphatic and cycloaliphatic ketones undergo selective multi-site cascade C–H functionalization with acetylene in the KOH/DMSO superbase suspension under mild conditions (70–80 °C, 0.5–1.0 h) to afford in one synthetic operation polycyclic bridgehead acetals with enol functionality, [methylene-6,8-dioxabicyclo[3.2.1]octanes] (the isolated yields reach 84%).
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