Synthesis of 4-pyrone derivatives by employing the mild cyclization is described. The DMSO–(COCl)2 and Ph3P–CCl4 conditions were appeared to accommodate a synthetic potential as proton equivalents. This study established the absolute configurations, and provided revisions of formerly proposed structures of highly oxygenated propionate derived 4-pyrones, such as ilikonapyrone, peroniatriols I and II, and onchitriols I and II.
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Yamamura et al. (1997) studied this question.
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