Use of the dehydrophos biosynthetic enzymes to prepare antimicrobial analogs of alaphosphin
作者:Despina J. Bougioukou、Chi P. Ting、Spencer C. Peck、Subha Mukherjee、Wilfred A. van der Donk
DOI:10.1039/c8ob02860e
日期:——
enzyme is also tolerant with respect to the aminoacid attached to tRNALeu. Using a mutant of leucyl tRNA synthetase that is deficient in its proofreading ability allowed the preparation of a series of aminoacyl-tRNALeu derivatives (Ile, Ala, Val, Met, norvaline, and norleucine). DhpH-C accepted these aminoacyl-tRNA derivatives and condensed the aminoacid with l-Ala(P) to form the corresponding phosphonodipeptides
Chemoselective <i>N</i>-Acylation via Condensations of <i>N</i>-(Benzoyloxy)amines and α-Ketophosphonic Acids under Aqueous Conditions
作者:Jasbir Singh Arora、Navneet Kaur、Otto Phanstiel IV
DOI:10.1021/jo800223j
日期:2008.8.1
22% yield upon addition of 2 equiv of TFA. The N-acylation reaction is highly chemoselective for N-benzoyloxyamines as both aliphatic amines and N-hydroxylamines were shown not to react productively with the α-ketophosphonic acids under the conditions tested. Moreover, the α-ketophosphonic acids are more selective than the related α-ketocarboxylic acid systems, which react with both the N-hydroxylamines
Several fungal strains, namely Bauveria bassiana, Cuninghamella echinulata, Aspergillus fumigatus, Penicillium crustosum and Cladosporium herbarum, were used as biocatalysts to resolve racemic mixtures of 1-aminoethanephosphonic acid using L/D amino acid oxidase activity. The course of reaction was analyzed by 31P-NMR in the presence of cyclodextrin used as chiral discriminating agent. The best result (42% e.e of R-isomer) was obtained with a strain of Cuninghamella echinulata.