Abstract
A novel silyl triflate-mediated [2,3]sigmatropic rearrangement of (allyloxy)acetates and their ketene silyl acetals is described, which is proposed to proceed via rarely precedented oxygen ylides. The formal [2,3]Wittlg shift is characterized by the unique stereoselectivity, i.e. , the rarely precedented Z -selectivity and the high erythro-selectivity.
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