Abstract

A key reactive species, lithium borylcyanocuprate, was isolated and fully characterized in a one-pot carboboration of alkynes. The carboboration involves a boryllithium, CuCN⋅2 LiCl, an ester-substituted alkyne, and an organic electrophile (see scheme). By changing the reaction temperature, the syn/anti ratio of the carboborated products can also be changed.

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