System in the Presence of Other Lewis Acids

2 Chalcogenide-mediated System in the Presence of Other Lewis Acids 

As mentioned above, BF3 -etherate was found to be ineffective for the chal-cogenide-promoted MBH reaction However, Kataoka et al. envisaged 

Indeed, the first example of other Lewis add, except for TiCU and BX3, catalyzed chalcogenide-MBH reactions dates back to the 1980s, when Noyori et al. first demonstrated that the conjugated addition of a silyl selenide to an enone catalyzed by TMSOTf provided a silyl enol ether, which can be successfully engaged in subsequent Mukaiyama retro-aldol reactions with various 

Basavaiah et al. have developed a similar domino Michael-Mukaiyama-retro-aldol process of cyclic enones with acetals, which conveniently were promoted by mixing a sulfide, TBDMSOTf, in the presence of the Hiinig s base. 

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