One-Pot Catalytic Asymmetric Synthesis of Pyranones
作者:Kevin Cheng、Ann Rowley Kelly、Rachel A. Kohn、Jessica F. Dweck、Patrick J. Walsh
DOI:10.1021/ol900905r
日期:2009.6.18
Enantioenriched pyranones are important intermediates in the synthesis of natural products and the generation of compound libraries. A one-pot method for their synthesis is outlined. Catalyticasymmetric alkylation of 2-furfurals in the presence of catalytic (−)-MIB generates enantioenriched furyl zinc alkoxides. Addition of water/THF followed by NBS results in formation of pyranones with ee’s >90%
Ruthenium-catalyzed hydrogenation of aromatic ketones using chiral diamine and monodentate achiral phosphine ligands
作者:Mengna Wang、Ling Zhang、Hao Sun、Qian Chen、Jian Jiang、Linlin Li、Lin Zhang、Li Li、Chun Li
DOI:10.1016/j.catcom.2021.106303
日期:2021.6
The Ru-catalyzed asymmetric hydrogenation of ketones with chiral diamine and monodentate achiral phosphine has been developed. A wide range of ketones were hydrogenated to afford the corresponding chiral secondary alcohols in good to excellent enantioselectivities (up to 98.1% ee). In addition, an appropriate mechanism for the asymmetric hydrogenation was proposed and verified by NMR spectroscopy.
Lipase-Catalyzed Domino Kinetic Resolution/Intramolecular Diels–Alder Reaction: One-Pot Synthesis of Optically Active 7-Oxabicyclo[2.2.1]heptenes from Furfuryl Alcohols and -Substituted Acrylic Acids
作者:Shuji Akai、Tadaatsu Naka、Sohei Omura、Kouichi Tanimoto、Masashi Imanishi、Yasushi Takebe、Masato Matsugi、Yasuyuki Kita
The first lipase-catalyzed domino reaction is described in which the acyl moiety formed during the enzymatic kineticresolution of furfuryl alcohols (+/-)-3 with a 1-ethoxyvinyl ester 2 was utilized as a part of the constituent structure for the subsequent Diels-Alder reaction. The preparation of ester 2 from carboxylic acid 1 and the subsequent domino reaction were carried out in a one-pot reaction