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The B(C6F5)3-catalyzed transesterification of a series of 3-alkenyl-oxindoles and other unsaturated tert-butyl esters with aryl-diazo esters is reported. This protocol is facile and generally high yielding proceeding under mild conditions and is remarkably chemoselective leaving the C[double bond, length as m-dash]C bonds intact.

Graphical abstract: Borane catalyzed transesterification of tert-butyl esters using α-aryl α-diazoesters

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