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Conjugate addition of lithium dimethylcuprate to 3-(p-tolylsulphinyl)chromone (1) proceeds with at least 90% diastereoselectivity, and the products from (S)-(1) can be converted into chiral 2-methylchroman-4-one (–)-(16).
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Saengchantara et al. (1986) studied this question.
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