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Synthesis of Borylated (Aminomethyl)cyclopropanes Using C 1 -Bisnucleophiles.
Organic Letters 2024 April 27
Lithiated 1,1-diborylalkanes have been used as nucleophilic coupling partners with a range of oxygen-based electrophiles, including esters, carbonyls, and epoxides. However, their reactivity with nitrogen-based electrophiles, such as aziridines, has remained relatively understudied. Herein, we show that lithiated 1,1-diborylalkanes react with α-halo and α-tosyl aziridines to yield borylated (aminomethyl)cyclopropanes-a privileged scaffold within medicinal chemistry. The reaction displays high levels of diastereoselectivity, enabling careful control of up to three stereocenters within a single transformation. DFT studies provide insight into the reaction mechanism, which diverges from that observed with analogous epihalohydrin starting materials. Derivatization studies were also performed on the products to demonstrate the utility of the boron and amine handles.
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