Basic CuCO<sub>3</sub>
/ligand as a new catalyst for 'on water' borylation of Michael acceptors, alkenes and alkynes: application to the efficient asymmetric synthesis of β-alcohol type sitagliptin side chain
作者:Gaj Stavber、Zdenko Časar
DOI:10.1002/aoc.2957
日期:2013.3
The efficient 'on water' β‐borylation using bis(pinacolato)diboron agent was achieved with a newly developed catalytic system based on basic copper carbonate and various ligands. The catalytic system was used for β‐borylation of various Michael acceptors, alkenes and alkynes. The presented methodology was successfully applied to the novel synthesis of β‐alcohol type sitagliptin side chain precursor
Iridium-catalyzed enantioselective hydrogenation of vinyl boronates
作者:Alexander Paptchikhine、Pradeep Cheruku、Mattias Engman、Pher G. Andersson
DOI:10.1039/b912590f
日期:——
The first Ir-catalyzed asymmetric hydrogenations of vinyl boronates have been performed using low catalyst loadings (0.5 mol%) and pressure (as low as 1 bar). Good selectivities (76–98% ee) were obtained for a range of substrates.