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The asymmetric synthesis of both enantiomers of cis-lauthisan (3) is achieved in only six steps from diethyl pimelate (4), the key steps being the diastereodivergent reduction of beta-ketosulfoxide 7 and the highly cis-stereoselective Et(3)SiH/TMSOTf-promoted reductive cyclization of enantiopure hydroxy sulfinyl ketones (S)-14 and (R)-14.
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Carreño et al. (2005) studied this question.
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