Preparation of new halogenated diphenyl pyrazine analogs in Escherichia coli by a mono-module fungal nonribosomal peptide synthetase from Penicillium herquei
biological approaches for their synthesis were poorly applied. Herein, microbial production of several halogenated diphenyl pyrazines is reported. These compounds are accumulated via feeding corresponding precursor analogs to Escherichia coli expressing a fungal non-ribosomal peptide synthetase HqlA. Substratespecificity of HqlA was also determined by comparing substrate incorporation efficiencies. HqlA
Pyrazine alkaloids via dimerization of amino acid-derived α-amino aldehydes: biomimetic synthesis of 2,5-diisopropylpyrazine, 2,5-bis(3-indolylmethyl)pyrazine and actinopolymorphol C
作者:Sandhya Badrinarayanan、Jonathan Sperry
DOI:10.1039/c2ob06935k
日期:——
of amino acid-derived alpha-amino aldehydes provides a short, biomimetic synthesis of several 2,5-disubstituted pyrazine natural products. The alpha-amino aldehyde intermediates were generated in situ by the hydrogenolysis of their Cbz-derivatives. It was found that a judicious choice of reaction solvent facilitated hydrogenolysis, dimerization and oxidation to the natural product in a one-pot operation
A New Method for the Synthesis of Symmetrical Disubstituted Pyrazines
作者:Nora Rojas、Yvonne Grillasca、Alejandrina Acosta、Irene Audelo、Gustavo García de la Mora
DOI:10.1002/jhet.1748
日期:2013.7
Through the self‐condensation of α‐amino aldehydes, the synthesis of symmetrical disubstitutedpyrazines was achieved in a three‐step one‐pot reaction. The α‐amino aldehydes were easily obtained by treating methyl esters of natural α‐amino acids with diisobutylaluminium hydride.