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The spiroacetal [C(9)–C(20)] fragments of spirofungins A and B, antibiotics isolated from Streptomyces violaceusniger Tü 4113, were prepared from a known bromo alcohol derived from ( S )-citronellal, using thermodynamically controlled iodolactonization and spiroacetalization as the key steps.
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Sakauchi et al. (2015) studied this question.
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