Asymmetric Synthesis of Protected α-Amino Boronic Acid Derivatives with an Air- and Moisture-Stable Cu(II) Catalyst
作者:Andrew W. Buesking、Vlad Bacauanu、Irene Cai、Jonathan A. Ellman
DOI:10.1021/jo500300t
日期:2014.4.18
access to synthetically useful and pharmaceutically relevant α-amino boronic acid derivatives. The Cu(II)-catalyzed reaction is performed on the benchtop in air at room temperature using commercially available, inexpensive reagents at low catalyst loadings. A variety of N-tert-butanesulfinyl imines, including ketimines, react readily to provide α-sulfinamido boronate esters in good yields and with
Asymmetric Copper-Catalyzed Synthesis of α-Amino Boronate Esters from <i>N</i>-<i>tert</i>-Butanesulfinyl Aldimines
作者:Melissa A. Beenen、Chihui An、Jonathan A. Ellman
DOI:10.1021/ja800829y
日期:2008.6.1
A general and efficient new method for the asymmetric synthesis of a-amino boronate esters has been developed. The key step is the Cu(I)-catalyzed addition of bis(pinacolato)diboron to N-tert-butanesulfinyl aldimines, which proceeds in good yields (52-88%) and with very high diastereoselectivities (>96:2) for a variety of aldimine substrates. This method was applied to an efficient synthesis of bortezomib, a potent a-amino boronic acid inhibitor of the proteasome that is in clinical use for the treatment of multiple myeloma and mantle cell lymphoma.