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2005 Silylation O 0278 Copper-Catalyzed Conjugate Addition of a Bis(triorganosilyl) Zinc and a Meth- yl(triorganosilyl) Magnesium. — A practical protocol for the Cu-catalyzed conjugate silylation of α,β-unsaturated carbonyl compounds such as (I) and (IV) utilizing bis(tri- organosilyl) zinc reagent (II) is described, that represents a useful alternative to known stoichiometric procedures. Moreover, mixed alkyl(triorganosilyl)magnesium reagent (VI) also transfer its silyl group to simple enones under copper catalysis. — (OESTREICH*, M.; WEINER, B.; Synlett 2004, 12, 2139-2142; Inst. Org. Chem. Biochem., Albert-Ludwigs-Univ., D-79104 Freiburg/Br., Germany; Eng.) — M. Schroeter 08- 052

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Page 1: Copper-Catalyzed Conjugate Addition of a Bis(triorganosilyl) Zinc and a Methyl(triorganosilyl) Magnesium

2005

SilylationO 0278 Copper-Catalyzed Conjugate Addition of a Bis(triorganosilyl) Zinc and a Meth-

yl(triorganosilyl) Magnesium. — A practical protocol for the Cu-catalyzed conjugate silylation of α ,β-unsaturated carbonyl compounds such as (I) and (IV) utilizing bis(tri-organosilyl) zinc reagent (II) is described, that represents a useful alternative to known stoichiometric procedures. Moreover, mixed alkyl(triorganosilyl)magnesium reagent (VI) also transfer its silyl group to simple enones under copper catalysis. — (OESTREICH*, M.; WEINER, B.; Synlett 2004, 12, 2139-2142; Inst. Org. Chem. Biochem., Albert-Ludwigs-Univ., D-79104 Freiburg/Br., Germany; Eng.) —M. Schroeter

08- 052

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