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Stereospecific nickel-catalyzed cross coupling of vinyl-dioxanones 1a, 1b, 1d, 1h and 1f with B2(pin)2 to form cyclopropanes 3p–3t.a
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Yields of material isolated by silica gel chromatography. All reactions were conducted using enantiomerically enriched starting materials. See Supporting Information for further experimental details.
