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Issue 1, 2007
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‘GaI’: A new reagent for chemo- and diastereoselective C–C bond forming reactions

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The potential of ‘GaI’ as a reductant in organic transformations, in particular C–C bond forming reactions involving α-functionalised ketones, has been investigated. Of most interest are the diastereoselective aldol coupling reactions of the α-alkoxy ketones, PhC(O)C(H)(OR)Ph, R = Me, Et or iPr, which give the novel γ-alkoxy, β-hydroxy ketones, PhC(O)C(H)(Ph)C(OH)(Ph)C(H)(OR)Ph, containing three contiguous stereogenic centres. The diastereostereoselectivity of these reactions was established from NMR spectroscopic and X-ray crystallographic studies of the products. When R = Me, the 2R,3S,4R/2S,3R,4S-enantiomeric pair is formed, whereas when R = Et or iPr, 2R, 3R, 4S/2S, 3S, 4R-diastereoisomers result. These differences are rationalised in terms of the likely transition states of the reactions. The same products are not formed when higher oxidation salts of gallium, or InI, are employed as the inorganic reagent. The reactivity of “GaI” towards α-halo ketones, a 1,2-diketone and α,β-unsaturated ketones has also been explored. Again, the outcomes of these reactions have been compared to those involving Ga(II) and Ga(III) reagents.

Graphical abstract: ‘GaI’: A new reagent for chemo- and diastereoselective C–C bond forming reactions

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The article was received on 20 Sep 2006, accepted on 07 Nov 2006 and first published on 08 Dec 2006

Article type: Paper
DOI: 10.1039/B613669A
Citation: New J. Chem., 2007,31, 127-134
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    ‘GaI’: A new reagent for chemo- and diastereoselective C–C bond forming reactions

    S. P. Green, C. Jones, A. Stasch and R. P. Rose, New J. Chem., 2007, 31, 127
    DOI: 10.1039/B613669A

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