Abstract
The first examples of the addition of organometallic reagents to electron deficient boron-substituted olefins are reported. Thus, copper catalysed addition of Grignard reagents to chiral acryloyl and vinylsulfonyl dioxazaborocines, followed by oxidative removal of the boron, gives β-hydroxy esters and sulfones with asymmetric inductions up to 81 and 95% ee, respectively.
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