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[reaction: see text] A direct synthesis of the alpha-hydroxyaldehyde exo-5, a precursor of the exo-spirotetronate subunit of the quartromicins, was achieved through an exo-selective Lewis acid-catalyzed Diels-Alder reaction of dienophile 12a and diene 1.

organic letters

Synthesis of Precursors of the Agalacto (<i>Exo</i>) Fragment of the Quartromicins via an Auxiliary-Controlled Exo<i>-</i>Selective Diels−Alder Reaction

Synthesis of Precursors of the Agalacto (Exo) Fragment of the Quartromicins via an Auxiliary-Controlled Exo-Selective Diels−Alder Reaction