Ther hodium-catalyzeda symmetric allenylation of sulfonylimines is disclosedp roviding silyl homoallenylamide productsi nu pt o9 9:1 er. Through subsequent activation of the C À Nb ondo f the silyl homoallenyl sulfonamide,p alladium-catalyzed stereospecific allylic allenylation could be achieved giving C À Cb ond formation with high chirality transfer.T he synthetic utility of both the silyl homoallenyl sulfonamides andt he silyl homoallenyl malonatesasb is(nucleophiles) is demonstrated.
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