Regiocontrolled Cobalt-Catalyzed Diels-Alder Reactions of Silicon-Functionalized, Terminal, and Internal Alkynes.

[摘要]：The efficient control of the regiochem. of the Diels-Alder adducts (isolated as substituted benzenes after oxidn. by DDQ), which are formed in excellent yields from 2-methyl-1,3-butadiene and alkynylsilanes, can be realized using Co complexes with a pyridine-imine ligand or a dppe ligand, resp. The application of 2-trimethylsilyloxy-1,3-butadiene leads to a very interesting cyclohexenone deriv., 4-(methylene)-3-(trimethylsilyl)cyclohex-2-en-1-one, suitable for further transformations.

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