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Synthesis of esters, carbonates and related compounds

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Chiral α-(carbamoyloxy)alkylcopper reagents, prepared using Hoppe's sBuLi/(-)-sparteine methodology and subsequent transmetalations with ZnCl2 and CuCN, reacted with various electrophiles to give enantiomerically pure alcohols after deprotection.
J. P. N. Papillon, R. J. K. Taylor, Org. Lett., 2002, 4, 119-122.


A bimetallic titanium complex [(salen)TiO]2 catalyzes the asymmetric addition of ethyl cyanoformate to aldehydes leading to cyanohydrin carbonates with high enantiomeric excesses.
Y. N. Belokon, A. J. Blacker, L. A. Clutterbuck, M. North, Org. Lett., 2003, 5, 4505-4507.