Impact of the N-Terminal Amino Acid on the Formation of Pyrazines from Peptides in Maillard Model Systems
作者:Fien Van Lancker、An Adams、Norbert De Kimpe
DOI:10.1021/jf301315b
日期:2012.5.9
peptide C-terminal amino acid was investigated, this study focused on the influence of the peptide N-terminal amino acid on the production of pyrazines in model reactions of glucose, methylglyoxal, or glyoxal. Nine different dipeptides and three tripeptides were selected. It was shown that the structure of the N-terminal amino acid is determinative for the overall pyrazine production. Especially, the production
Process for preparing pyrazines from hydroxyamines
申请人:TEXACO DEVELOPMENT CORPORATION
公开号:EP0363532A1
公开(公告)日:1990-04-18
This invention relates to the reaction of hydroxyamines to form pyrazines by a process comprising reacting said hydroxyamine in the presence of a catalyst which may be a transition metal catalyst optionally containing an alkaline earth metal oxide, or alternatively the catalyst may be a rhodium, ruthenium or palladium-containing compound and a phosphine-containing compound.
Pyrazine Biosynthesis in Corynebacterium glutamicum
作者:Jeroen S. Dickschat、Susanne Wickel、Christoph J. Bolten、Thorben Nawrath、Stefan Schulz、Christoph Wittmann
DOI:10.1002/ejoc.201000155
日期:2010.5
the acetoin precursor (S)-2-acetolactate into the pathway intermediate (R)-2,3-dihydroxy-3-methylbutanoate to the branched amino acids. This mutant requires valine, leucine, and isoleucine for growth and produces significantly higher amounts and more different compounds of the acyloin and pyrazine classes. Gene deletion of the acetolactate synthase (AS) resulted in a mutant that is not able to convert
Site-Selective C–H Alkylation of Diazine <i>N</i>-Oxides Enabled by Phosphonium Ylides
作者:Prithwish Ghosh、Na Yeon Kwon、Sangil Han、Saegun Kim、Sang Hoon Han、Neeraj Kumar Mishra、Young Hoon Jung、Sang J. Chung、In Su Kim
DOI:10.1021/acs.orglett.9b02365
日期:2019.8.16
The synthesis of alkylated diazine derivatives is important for their practical utilization as pharmaceuticals and for other purposes. Herein, we describe the metal-free site-selectiveC–H alkylation of diazine N-oxides using phosphonium ylides that affords a variety of alkylated diazine derivatives with broad functional group tolerance. The utility of this method is showcased by the late-stage functionalization
Formation of Pyrazines in Maillard Model Systems of Lysine-Containing Dipeptides
作者:Fien Van Lancker、An Adams、Norbert De Kimpe
DOI:10.1021/jf903898t
日期:2010.2.24
respectively. Generally, the pyrazines were produced more in the case of dipeptides as compared to free amino acids. For reactions with glucose and methylglyoxal, this difference was mainly caused by the large amounts of 2,5(6)-dimethylpyrazine and trimethylpyrazine produced from the reactions with dipeptides. For reactions with glyoxal, the difference in pyrazine production was rather small and mostly unsubstituted