Synthesis of Vinyl Boronates from Aldehydes by a Practical Boron–Wittig Reaction
作者:John R. Coombs、Liang Zhang、James P. Morken
DOI:10.1021/acs.orglett.5b00480
日期:2015.4.3
A highly stereoselectiveboron-Wittigreaction between stable and readily accessible 1,1-bis(pinacolboronates) and aldehydes furnishes a variety of synthetically useful di- and trisubstituted vinyl boronate esters.
The highlyselective copper‐catalyzed hydroboration of allenes has been developed. Allylboranes and alkenylboranes were selectively prepared by the judicious choice of catalytic species (copper hydride and boryl copper). Furthermore, two types of alkenylboranes could be selectively synthesized by the choice of an appropriate ligand. Mechanistic studies confirmed that the protonation of a (Z)‐σ‐allyl