Synthesis of a new bulky phosphite ligand and its application in the enantioselective hydrogenation
作者:Marina V. Sokolovskaya、Sergey E. Lyubimov、Igor S. Mikhel、Kirill P. Birin、Vadim A. Davankov
DOI:10.1016/j.jorganchem.2018.02.038
日期:2018.4
bulky phosphite ligand was synthesized and tested in the asymmetric Rh-catalyzed hydrogenation of a series of substrates, including dimethyl itaconate (up to 95% ee), α- and β-dehydroamino acid derivatives (up to 88% and 76% ee, respectively). In the Ir-catalyzed hydrogenation of 2-methylindole, the use of iodine as an additive led to a significant increase in the enantioselectivity and conversion.
A concise and effective ruthenium-catalyzed asymmetric transferhydrogenation of β-substituted α-oxobutyrolactones has been developed, delivering a series of cis-β-substituted α-hydroxybutyrolactone derivatives with excellent yields, enantioselectivities, and diastereoselectivities. Two consecutive stereogenic centers were constructed in one step through dynamic kinetic resolution under basic conditions