858884-54-5Relevant articles and documents
Synthesis of a library of chiral α-amino acid-based borate counteranions and their application to copper catalyzed olefin cyclopropanation
Llewellyn, David B.,Arndtsen, Bruce A.
, p. 1789 - 1799 (2007/10/03)
Twenty borate counteranions have been prepared from tartaric acid and α-amino acid derivatives. Ion pairing of these anions to a copper cation can be used to induce enantioselectivity into the copper catalyzed cyclopropanation of styrene. Structural modification of the anion provides insight into the importance of each component of the counteranion in asymmetric induction.