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2004
Addition reactions
O 0060
γ-Selective Allylic Substitution Reaction with Grignard Reagents Catalyzed by
N-Heterocyclic Carbene Complexes and Its Application to Enantioselec44- 042 Copper
tive Synthesis. — Alkyl Grignards react with allylic substrates in the presence of a catalytic amount of copper N-heterocyclic carbene complex (I) to give the γ-substituted
products highly preferentially. A chiral version (II) of the catalyst provides only moderate e.e.'s at best. — (TOMINAGA, S.; OI, Y.; KATO, T.; AN, D. K.; OKAMOTO*,
S.; Tetrahedron Lett. 45 (2004) 29, 5585-5588; Dep. Appl. Chem., Fac. Eng.,
Kanagawa Univ., Kanagawa, Yokohama 221, Japan; Eng.) — Mais
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