Trimethylaluminum-Triflimide Complexes for the Catalysis of Highly Hindered Diels-Alder Reactions

[摘要]：Two catalysts, Me2AlNTf2 and MeAl(NTf2)(2), derived from the mixing of trimethylaluminum with triflimide, proved to be highly effective catalysts in hindered Diels-Alder reactions, generating the desired Diels-Alder cycloadducts from both hindered 2-silyloxydienes and hindered dienophiles. Thus reaction of 1 with 2 afforded the hindered cycloadduct 4 in excellent yield in 0.5-1.5 h at -40 degrees C.

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