Hydroperoxylation by Hydroxyethylphosphonate Dioxygenase
摘要:
Hydroxyethylphosphonate dioxygenase (HEPD) catalyzes the O-2-dependent cleavage of the carbon-carbon bond of 2-hydroxyethylphosphonate (2-HEP) to afford hydroxymethylphosphonate (HMP) and formate without input of electrons or use of any organic cofactors. Two mechanisms have been proposed to account for this reaction. One involves initial hydroxylation of substrate to an acetal intermediate and its subsequent attack onto an Fe(IV)-oxo species. The second mechanism features initial hydroperoxylation of substrate followed by a Criegee rearrangement. To distinguish between the two mechanisms, substrate analogues were synthesized and presented to the enzyme. Hydroxymethylphosphonate was converted into phosphate and formate, and 1 -hydroxyethylphosphonate was converted to acetylphosphate, which is an inhibitor of the enzyme. These results provide strong support for a Criegee rearrangement with a phosphorus-based migrating group and require that the O-O bond of molecular oxygen is not cleaved prior to substrate activation. (2R)-Hydroxypropylphosphonate partitioned between conversion to 2-oxopropylphosphonate and hydroxymethylphosphonate, with the latter in turn converted to phosphate and formate. Collectively, these results support a mechanism that proceeds by hydroperoxylation followed by a Criegee rearrangement.
[EN] METHOD FOR THE MANUFACTURE OF COMPOUNDS CONTAINING AN a-OXY PHOSPHORUS GROUP<br/>[FR] PROCÉDÉ POUR LA FABRICATION DE COMPOSÉS CONTENANT UN GROUPE ?-OXY-PHOSPHORÉ
申请人:STRAITMARK HOLDING AG
公开号:WO2012098255A1
公开(公告)日:2012-07-26
A method for the manufacture of compounds containing an α-oxy phosphorus group is disclosed. A P-O component having at least one P-O-P moiety, whereby at least one phosphorus has the +3 oxidation state, is added in specific proportions to a compound containing an α-oxy carboxylic acid group, followed by conducting the reaction and adding water subsequently. The compounds containing an α-oxy phosphorus group formed can then be recovered.
A Simple, Efficient Synthesis of Dibenzyl and Di-<i>p</i>-nitrobenzyl 1-Hydroxyalkanephosphonates
作者:Maria Hoffmann
DOI:10.1055/s-1988-33434
日期:——
Dibenzyl and di-p-nitrobenzyl 1-hydroxyalkanephosphonates 3a-i are prepared by alkylation of 1-hydroxyalkanephosphonic acids 1 with O-benzyl and O-(p-nitrobenzyl)-N,N′-dicyclohexylisoureas 2.
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
THE FORMATION OF α-AMINO AND α-HYDROXY-ALKANEPHOSPHONIC ACIDS IN THE REACTIONS OF PHOSPHITE ESTERS WITH ALDEHYDES AND ALKYL CARBAMATES
作者:Harry R. Hudson、Fatima Ismail、Max Pianka、Chi-Wai Wan
DOI:10.1080/10426500008045250
日期:2000.1
Abstract The preparation of α-aminoalkanephosphonic acids fromtriphenylphosphite, an aldehyde, and ethyl or benzyl carbamate in glacial acetic acid, followed by hydrolysis, is accompanied by the formation of the corresponding α-hydroxyphosphonic acid. Reaction in toluene, using boron trifluoride-etherate as catalyst, affords an alternative reparative procedure but does not prevent the formation of
Deamination of 1-Aminoalkylphosphonic Acids: Reaction Intermediates and Selectivity
作者:Anna Brol、Tomasz K. Olszewski
DOI:10.3390/molecules27248849
日期:——
acids in the reaction with HNO2 (generated "in situ" from NaNO2) yields a mixture of substitution products (1-hydroxyalkylphosphonic acids), elimination products (vinylphosphonic acid derivatives), rearrangement and substitution products (2-hydroxylkylphosphonic acids) as well as H3PO4. The variety of formed reaction products suggests that 1-phosphonoalkylium ions may be intermediates in such deamination