121722-22-3Relevant articles and documents
Synthesis of phosphinic and phosphonic analogs of aspartic acid
Khomutov,Osipova,Khurs,Alferov,Khomutov
, p. 1961 - 1964 (2007/10/03)
Approaches to the synthesis of 1-amino- and 2-amino-2-carboxyethylphosphinic and -phosphonic acids have been studied. A convenient method for the preparation of phosphinic acids is the reactions of ethyl diethoxymethylphosphonite with ethyl acetamidomethylenemalonate and ethyl 2-acetamidoacrylate.
Synthesis of 1-Aminoalkylphosphinic Acids. Part 2. An Alkylation Approach
McCleery, Patrick P.,Tuck, Brian
, p. 1319 - 1329 (2007/10/02)
Aminomethylphosphinic acid (7), protected at nitrogen as the imine derived from benzophenone and at phosphorus as the diethylacetal and ethyl ester , undergoes facile LDA-induced alkylation.Treatment with primary alkyl halides affords, on product hydrolysis, a versatile route to phosphinic analogues of α-amino carboxylic acids.Analogues of alanine, valine, leucine, phenylalanine, tyrosine, histidine, and aspartic and glutamic acids are thus prepared; the phosphonic histidine analogue (23b) can be prepared similarly from the imine phosphonate diester (21).Intra- and inter-molecular dialkylation reactions provide analogues of 1-aminocyclopropanecarboxylic acid (14) and 2,6-diaminoheptanedioic acid (16).Benzyl bromide alkylation of (25a) and (30a), where the nitrogen is protected as the imine of the 2-hydroxypinan-3-one chiral auxiliary (24) or (29), is diastereospecific leading to asymmetric synthesis of either (+)- or (-)-phenylalanine analogues; this selectivity is compared to that shown by the corresponding chiral imine phosphonate (25b) and imine carboxylate (25c).
