Enantioselective Copper‐Catalyzed Sequential Hydrosilylation of Arylmethylenecyclopropanes

Abstract

AbstractDespite impressive advances in the construction of enantioenriched silacarbocycles featuring silicon‐stereogenic centers via a selection of well‐defined sila‐synthons, the development of a more convenient and economic method with readily available starting materials is significantly less explored and remains a considerable challenge. Herein, we report the first example of copper‐catalyzed sequential hydrosilylation of readily accessible methylenecyclopropanes (MCPs) and primary silanes, affording an efficient and convenient route to a wide range of chiral silacyclopentanes bearing consecutive silicon‐ and carbon‐stereogenic centers with excellent enantio‐ and diastereoselectivities (generally ≥98 % ee, >25 : 1 dr). Mechanistic studies reveal that these reactions combine copper‐catalyzed intermolecular ring‐opening hydrosilylation of aryl MCPs and intramolecular asymmetric hydrosilylation of the resultant Z/E mixture of homoallylic silanes.