名称:
Synthesis and evaluation of a broad range of new chiral phosphine–carbene ligands for asymmetric hydrogenation
摘要:
A straightforward and gram scale synthesis (six-step synthesis from enantioenriched beta-hydroxy esters) of new structurally simple phosphine-carbene ligands bearing a single stereogenic centre has been achieved. Enantioselectivities of up to 60-63% could be achieved in the hydrogenation of methylstilbene and dehydroaminoacids when the reactions were performed under 20-50 bar hydrogen pressure. (C) 2011 Elsevier Ltd. All rights reserved.
DOI:
10.1016/j.tetasy.2011.02.017