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Novel, versatile erythro-C5 building blocks with desired D- or L-configuration can be obtained in high enantiomeric purity from the achiral alcohol 1. The reaction sequence is reproduced below for the case of the L-series. L-2 can be converted into L-3 and L-4, and also however—via D-5—into D-3 and D-4.
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Häfele et al. (1986) studied this question.
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