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The pyranosyl unit 11 (2-formyl-6-1,2-(isopropylidenedioxy)ethyl-5-methyltetrahydropyran) of tetronasin was prepared from D-glyceraldehyde acetonide and a coupling reaction between 11 and the sulfone 13 (5-(1-methoxyethyl)-3-methyl-2-1-methyl-2-(phenylsulfonyl)ethyltetrahydrofuran) of a tetrahydrofuranyl fragment gave the desired C14-C27 fragment of tetronasin.
Lee et al. (Tue,) studied this question.