α,α′-Dioxothiones part 2. Asymmetric Die
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Giorgio Boccardo; Giuseppe Capozzi; Meri Giuntini; Stefano Menichetti; Cristina
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Article
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1997
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Elsevier Science
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French
⚖ 660 KB
Chiral non-racemic ¢x,ct'-dioxothiones 2a.g and 17 are obtained from chiral [~-ketoesters using the phthalimidesulfenyl chloride 1 as key reagent. The ability of these thiones to discriminate between the enantiotopic faces of several dienophiles has been evaluated. The best diastereoisomeric excesse