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Takemoto, Yuki; Yoshida, Hiroto; Takaki, Ken
Chemistry : a European journal, November 12, 2012, Letnik: 18, Številka: 46Journal Article
Regio‐ and stereoselective installation of boryl and stannyl moieties into a carbon–carbon triple bond of various alkynes has been achieved based on a three‐component coupling reaction by using a diboron and a tin alkoxide with the aid of a copper(II) acetate–tricyclohexylphosphine complex, giving diverse vic‐borylstannylalkenes in a straightforward manner. Carbon–tin and carbon–boron bonds of the resulting borylstannylation product are successively transformed into carbon–carbon bonds by a Migita–Kosugi–Stille and a Suzuki–Miyaura coupling, leading to the formation of (Z)‐tamoxifen with anti‐breast cancer activity. Borylstannylation: A copper–tricyclohexylphosphine complex was found to catalyse the three‐component borylstannylation of alkynes with a diboron and a tin alkoxide to afford vic‐borylstannylalkenes in a regio‐ and stereoselective manner. Synthetic utility of the resulting borylstannylation product was demonstrated by a three‐step synthesis of (Z)‐tamoxifen from commercially available substrates by successive Migita–Kosugi–Stille and Suzuki–Miyaura couplings (see scheme).
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