Mutsumi Sada

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About 40 years have passed since methylene dizinc reagent was discovered as a substitute for Wittig reagent. Density functional theory (DFT) calculations have been performed to understand the reaction pathways of methylenation of carbonyl compounds with bis(iodozincio)methane. The present computational/theoretical study concluded that the methylenation(More)
1,4-Addition of bis(iodozincio)methane to simple α,β-unsaturated ketones does not proceed well; the reaction is slightly endothermic according to DFT calculations. In the presence of chlorotrimethylsilane, the reaction proceeded efficiently to afford a silyl enol ether of β-zinciomethyl ketone. The C--Zn bond of the silyl enol ether could be used in a(More)
In the presence of a palladium catalyst, treatment of γ-acyloxy-α,β-unsaturated ketone with bis(iodozincio)methane caused umpolung of π-allylpalladium to give a zinc dienolate. Thus formed zinc species afforded a cyclohexene derivative via a self-condensation reaction. It is noteworthy that the three adjacent stereogenic centers were created in a single(More)
Treatment of an gamma-acyloxy-alpha,beta-unsaturated ketone with bis(iodozincio)methane leads to a novel tandem reaction consisting of three steps: (1) 1,4-addition of the dizinc reagent to the enone, which affords the corresponding zinc enolate of the beta-zinciomethylated ketone; (2) intramolecular nucleophilic attack by the enolate on the ester group;(More)
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