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The antiherpetic anthrapyran antibiotic (14S,16R)-AH-1763 IIa (see right-hand structure) and its (14R,16R) diastereomer have been prepared in enantioselective total syntheses. The relative and absolute stereochemistry of the natural product was established as (14R,16S), and a general high-yielding, selective approach to anthrapyran antibiotics was developed.
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Tietze et al. (2006) studied this question.
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