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).
S. T. Saengchantara and T. W. Wallace, J. Chem. Soc., Chem. Commun., 1986, 1592 DOI: 10.1039/C39860001592
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