Cobalt-Catalyzed Intermolecular [2 + 2 + 2] Cycloaddition for the Synthesis of 1,3-Cyclohexadienes.

[摘要]：A cobalt(I)-catalyzed [2 + 2 + 2] cycloaddn. reaction between an internal acceptor-substituted alkyne and a terminal alkene leads to the formation of regiochem. enriched polysubstituted 1,3-cyclohexadiene derivs. I (R1 = Me, R2 = Bu, hexyl, CH2:CHCH2CH2, Me2CHCH2, TMSCH2) in acceptable yields when Me butynoate is used, whereas regiochem. pure products are formed in good yields form Ph propynoate I [R1 = Ph, R2 = hexyl, Me2CHCH2, 3,4-(MeO)2C6H3CH2, etc.]. The concurrent cyclotrimerization reaction of the alkyne to the corresponding benzene deriv. is dependent on the sterical bulk of the alkyne and is considerably reduced with the sterically more hindered alkyne.

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