Look again: Highlights of the 20-step synthesis of callipeltoside C include the proline-catalyzed direct aldol reaction, enantioselective α-oxyamination reaction, and rapid access to the carbohydrate framework using a de novo synthesis protocol. Based on this work the previously assigned absolute configuration of the pendent 2-O-methylevalose unit has been revised.
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Carpenter et al. (2008) studied this question.
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