2001 cycloaddition reactions

cycloaddition reactionsO 0070

17 - 037Diels–Alder Reactions of β-Trifluoroacetylvinylsulfones. — Trifluo-roacetylvinylsulfones (I) and its hydrated form (V) are used as dienophiles inDiels–Alder reactions. The dienophiles are conveniently prepared reagents whichgive the corresponding cycloadducts in good yields under mild conditions. Usingenones (I) only the trans isomeric products are obtained. Elimination of sulfonylgroup from cycloadducts leads to α,β-unsaturated trifluoromethylketones ingood yields. — (KRASOVSKY, ARKADY L.; NENAJDENKO, VALENTINEG.; BALENKOVA, ELIZABETH S.; Tetrahedron 57 (2001) 1, 201-209; Dep.Chem., Lomonosov Moscow State Univ., Moscow 119899, Russia; EN)

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