Erythroselective aldol condensation of amine Free 2-t-butyl-5-methyl-2-phenyl-1,3-dioxolan-4-one lithium enolate synthesis of the ethyl acetolactate enantiomers
作者:Alfred Greiner、Jean-Yves Ortholand
DOI:10.1016/s0040-4039(00)74171-2
日期:1992.3
Generated by halogen metal exchange, the sterically hindered 2-t-butyl-5-methyl-2-phenyl -1,3-dioxolan-4-one lithium enolate reacts in an erythroselective way with acetaldehyde. Separation of the resulting diastereomers, followed by alcoholysis lead to the corresponding enantiomerically pure diols.
Chiral Primary Amine/Ketone Cooperative Catalysis for Asymmetric α-Hydroxylation with Hydrogen Peroxide
作者:Mao Cai、Kaini Xu、Yuze Li、Zongxiu Nie、Long Zhang、Sanzhong Luo
DOI:10.1021/jacs.0c11787
日期:2021.1.20
catalytic strategies, aminocatalysis and carbonyl catalysis do not coexist well, and, as such, a cooperative amine/carbonyl dual catalysis remains essentially unknown. Here we report a cooperative primary amine and ketone dual catalytic approach for the asymmetric α-hydroxylation of β-ketocarbonyls with H2O2. Besides participating in the typical enamine catalytic cycle, the chiral primary amine catalyst
A One‐Pot Two‐Step Enzymatic Pathway for the Synthesis of Enantiomerically Enriched Vicinal Diols
作者:Pier Paolo Giovannini、Michel Müller、Francesco Presini、Serena Baraldi、Daniele Ragno、Graziano Di Carmine、Christian Jacoby、Giovanni Bernacchia、Olga Bortolini
DOI:10.1002/ejoc.202001542
日期:2021.2.12
this report a ThDP‐dependent lyase (Ao : DCPIP OR) and a NADH‐dependent reductase (AAR) have been consecutively employed in two steps without intermediate work‐up and purification, affording enantiomericallyenriched 1,2‐diols in good yield (up to 78 %). The reductase cloning and overexpression is herein reported for the first time.