Regio‐ and (E)‐Stereoselective Triborylation of Propargylic Carbonates
2017
An efficient synthesis of (E)-alken-1,2,3-triboronates form readily available propargylic carbonates is described. The reaction enjoys excellent regio- and E-selectivity and many synthetically useful functional groups can be tolerated. Based on mechanistic studies, a two-step mechanism via 1,2-allenyl boronate intermediate is proposed.
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