Micellar effects in the nitrous acid deamination reaction of (R)-[1-2H]-1-octanamine
摘要:
The nitrous acid deamination of 1-octanamine (1) afforded mixtures of isomeric octenes, octanols, and octyl nitrites. The aggregation of 1.HClO4 in micelles induced the formation of dioctyl ethers and of 1-nitrooctane as additional products. In homogeneous solution (submicellar aqueous conditions or HOAc), [1-H-2]-1-octanol was obtained from [1-H-2]-1 with ca. 95% inversion of configuration. Above the critical micelle concentration, the enantiomeric purity of [1-H-2]-1-octanol decreased while [1-H-2]-1-nitrooctane was formed with ca.90% retention of configuration. 1-Octyl..NO2 radical pairs, rather than ion pairs, are likely to intervene on the retentive route to 1-nitrooctane and 1-octyl nitrite. Equilibration, via NO exchange, of (R)-[1-H-2]-1-octyl nitrite with the more abundant (S)-[1-H-2]-1-octanol is thought to account for the diminished ee of both products.
Enantioselective Synthesis of (<i>R</i>)- and (<i>S</i>)-1-<sup>2</sup>H-1-Octanol and Their Corresponding Amines
作者:Diederik W. R. Balkenende、Seda Cantekin、Christopher J. Duxbury、Marcel H. P. van Genderen、E. W. Meijer、Anja R. A. Palmans
DOI:10.1080/00397911.2010.527422
日期:2012.2.15
provided a one-step procedure from a commercially available starting compound to both enantiomers of 1-2H-1-octanol in good yields (>80%) and good enantiomeric excess (∼97%). The (S)-alcohols were converted to their corresponding (R)-amines, which showed ee's around 90%. GRAPHICAL ABSTRACT
Micellar effects in the nitrous acid deamination reaction of (R)-[1-2H]-1-octanamine
作者:Daniel Brosch、Wolfgang Kirmse
DOI:10.1021/jo00057a025
日期:1993.2
The nitrous acid deamination of 1-octanamine (1) afforded mixtures of isomeric octenes, octanols, and octyl nitrites. The aggregation of 1.HClO4 in micelles induced the formation of dioctyl ethers and of 1-nitrooctane as additional products. In homogeneous solution (submicellar aqueous conditions or HOAc), [1-H-2]-1-octanol was obtained from [1-H-2]-1 with ca. 95% inversion of configuration. Above the critical micelle concentration, the enantiomeric purity of [1-H-2]-1-octanol decreased while [1-H-2]-1-nitrooctane was formed with ca.90% retention of configuration. 1-Octyl..NO2 radical pairs, rather than ion pairs, are likely to intervene on the retentive route to 1-nitrooctane and 1-octyl nitrite. Equilibration, via NO exchange, of (R)-[1-H-2]-1-octyl nitrite with the more abundant (S)-[1-H-2]-1-octanol is thought to account for the diminished ee of both products.
Topological Study of Mechanistic Diversity in Conjugated Fatty Acid Biosynthesis
作者:Palash Bhar、Darwin W. Reed、Patrick S. Covello、Peter H. Buist
DOI:10.1002/anie.201202080
日期:2012.7.2
Variations on an oxidative theme: The precision with which FAD2‐type desaturases carry out CH activation reactions on flexible lipidic substrates is astonishing. The conformational space available within the active site of these enzymes has been explored using deuterium‐labeled substrates, and evidence for a novel quasi‐eclipsed conformer has been uncovered. The scheme shows some prototypical substrate