Categories: C-O Bond Formation > Synthesis of esters >
Redox Esterification
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Recent Literature

Homoenolates are generated by reaction of N-heterocycle carbenes with enals,
leading to carbon-carbon bond formation or activated carboxylates depending
on the used base. The design of a new triazolium
precatalyst enabled the catalytic, atom-economical redox esterification of
enals.
S. S. Sohn, J. W. Bode, Org. Lett., 2005,
7, 3873-3876.

N-Heterocyclic carbenes are effective
catalysts for an Umpolung reaction of α,β-unsaturated aldehydes. The generated homoenolate species can be protonated, and the resulting activated
carbonyl unit is trapped with an alcohol nucleophile to form a saturated ester.
A. Chan, K. A. Scheidt, Org. Lett., 2005,
7, 905-908.

The catalytic generation of activated carboxylates from epoxyaldehydes
enables a direct, anti-selective, convenient and mild synthesis of
β-hydroxyesters.
K. Y.-K. Chow, J. W. Bode, J. Am. Chem. Soc.,
2004,
126, 8126-8127.
