Enantio‐ and Diastereoselective Copper‐Catalyzed Allylboration of Alkynes with Allylic
<i>gem</i>
‐Dichlorides
作者:Andrea Chaves‐Pouso、Andrés M. Álvarez‐Constantino、Martín Fañanás‐Mastral
DOI:10.1002/anie.202117696
日期:2022.6.7
AbstractAllylic gem‐dichlorides are shown to be efficient substrates for catalytic asymmetric allylboration of alkynes. The method employs a chiral NHC−Cu catalyst capable of generating in a single step chiral skipped dienes bearing a Z‐alkenyl chloride, a trisubstituted E‐alkenyl boronate and a bis‐allylic stereocenter with excellent levels of chemo‐, regio‐ enantio‐ and diastereoselectivity. This high degree of functionalization makes these products versatile building blocks as illustrated with the synthesis of several optically active compounds. DFT calculations support the key presence of a metal cation bridge ligand–substrate interaction and account for the stereoselectivity outcome.