PMID: 11330905May 2, 2001Paper

Change of the reaction pattern by methodological variations in a multicomponent assembly promoted by Ni complexes

Chemistry : a European Journal
G García-Gómez, J M Moretó

Abstract

The pi-allylnickel complex formed by the addition of trimethylsilyl chloride (TMSCl) to a mixture of [Ni-(cod)2] (cod = 1,5-cyclooctadiene) and a vinyl ketone (Mackenzie complex) carbometalates an acetylene in a completely regioselective manner resulting in the formation of the corresponding vinyl nickel species. This intermediate is capable of controlled quenching in a variety of ways to give different types of compounds: under a CO atmosphere, an acylnickel species is formed that ensues from the carbometalation of the enol ether double bond to form cyclo-pentenone derivatives. Alternatively, if acetylene is present in excess and CO is absent, another acetylene moiety will replace the CO and cyclohexadienes will result instead. Finally, if only an excess of the vinyl ketone is used, the product from a slow double addition of the vinyl ketone across the triple bond is formed. The regioselectivities obtained by the present method are different from those obtained by the involvement of nickel acyclopentadienes as intermediates when the order of addition is reversed.

References

Oct 24, 2001·The Journal of Organic Chemistry·Shin-ichi Ikeda SiYoshiro Sato
Feb 1, 1996·Chemical Reviews·Mark LautensWilliam Tam
Mar 28, 1996·Chemical Reviews·Iwao OjimaRobert J. Donovan
Apr 20, 1998·Angewandte Chemie·Oliver Geis, Hans-Günther Schmalz

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Citations

Feb 24, 2006·Chemical Communications : Chem Comm·Shin-ichi IkedaKazunori Odashima
Aug 19, 2004·Journal of the American Chemical Society·Shin-ichi IkedaKazunori Odashima
Oct 10, 2002·Journal of the American Chemical Society·Shin-Ichi IkedaKazunori Odashima

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