Copper(I)-Catalyzed Regioselective Propargylic Substitution Involving Si-B Bond Activation

[摘要]：The silicon nucleophile generated by copper(I)-catalyzed Si-B bond activation allows several gamma-selective propargylic substitutions. The regioselectivity (gamma:alpha ratio) Is strongly dependent on the propargylic leaving group. Chloride Is superior to oxygen leaving groups in linear substrates (gamma:alpha > 99:1), and it is only the phosphate group that also shows promising regiocontrol (gamma:alpha = 90:10). That leaving group produces superb gamma-selectivity (gamma:alpha > 99:1) in alpha-branched propargylic systems, and enantioenriched substrates react with excellent central-to-axial chirality transfer.

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