Synthesis of phosphinic and phosphoric analogs of aspartic acid
作者:A. R. Khomutov、T. I. Oslpova、E. N. Khurs、K. V. Alferov、R. M. Khomutov
DOI:10.1007/bf01457787
日期:1996.8
Approaches to the synthesis of 1-amino- and 2-amino-2-carboxyethylphosphinic and-phosphoric acids have been studied. A convenient method for the preparation of phosphinicacids is the reactions of ethyl diethoxymethylphosphonite with ethyl acetamidomethylenemalonate and ethyl 2-acetamidoacrylate.
Chloroacetylation delivered an ester, which was resolved in a two-phase system by using the lipase from Thermomyces lanuginosus. Racemic and (S)-α-hydroxyphosphonate 6 were converted to (±)- and (R)-phosphaaspartic acid by functional-group manipulation. (±)-, (R)- and (S)-6 were first esterified with 4-nitrobenzenesulfonyl chloride before hydroboration to transform the double bond into a hydroxyethyl group. The hydroxyl
Synthesis of α-aminophosphonic and α-aminophosphinic acids and derived dipeptides from 4-acetoxyazetidin-2-ones
作者:Malcolm M. Campbell、Nicholas Carruthers
DOI:10.1039/c39800000730
日期:——
osphinates, obtained from the Arbusov reactions of 4-acetoxyazetidin-2-one and 4α-acetoxy-3β-phthalimidoazetidin-2-one with a variety of phosphites and phosphonites, were hydrolysed to β-phosphono- and β-phosphino-β-alanine derivatives which were converted into alanyl dipeptides; conditions for the sequential removal of protecting groups for carboxylic acids, phosphonic acids, and amines were investigated
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