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Sulfur tyranny: Thiiranes, instead of oxiranes, can be obtained in a highly stereoselective manner through the cycloaddition reaction of N-acyl oxazolidine tethered diazo thione compounds with aldehydes catalyzed by RhII. Thus, this reaction provides versatile adducts S functionalized at both the α and β position, with concomitant generation of two contiguous stereocenters.
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Cano et al. (2012) studied this question.
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