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. 2013 Sep 6;15(17):4516-9.
doi: 10.1021/ol402081p. Epub 2013 Aug 15.

Dinuclear zinc-ProPhenol-catalyzed enantioselective α-hydroxyacetate aldol reaction with activated ester equivalents

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Dinuclear zinc-ProPhenol-catalyzed enantioselective α-hydroxyacetate aldol reaction with activated ester equivalents

Barry M Trost et al. Org Lett. .

Abstract

An enantioselective α-hydroxyacetate aldol reaction that employs N-acetyl pyrroles as activated ester equivalents and generates syn 1,2-diols in good yield and diastereoselectivity is reported. This dinuclear zinc-ProPhenol-catalyzed transformation proceeds with high enantioselectivity with a wide variety of substrates including aryl, alyl, and alkenyl aldehydes. The resulting α,β-dihydroxy activated esters are versatile intermediates for the synthesis of a variety of carboxylic acid derivatives including amides, esters, and unsymmetrical ketones.

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Figures

Figure 1
Figure 1
Variation of activated ester structure.
Scheme 1
Scheme 1
Hydroxyacetyl aldol in laulimalide synthesis.
Scheme 2
Scheme 2
Synthesis of N-(α-hydroxyacetyl)-2-ethylpyrrole.
Scheme 3
Scheme 3
Derivatization of N-acylpyrrole products.
Scheme 4
Scheme 4
Diol synthesis towards peloruside A.

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