Stable, enantiomerically pure alkenylboronic esters 2 are conveniently prepared by direct hydroboration employing the new 1,3,2-dioxaborolane 4; their highly diastereoselective cyclopropanation can be achieved.
J. E. A. Luithle, J. Pietruszka and A. Witt, Chem. Commun., 1998, 2651 DOI: 10.1039/A807163B
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