Diastereoselective synthesis of 4-substituted 2-amino-4-phosphonobutanoic acids
摘要:
Conjugate additions of the lithiated bis-lactim ether derived from cyclo-[Gly-D-Val] 1 to alpha-substituted vinylphosphonates 2 or electrophilic substitutions on the lithiated bis-lactim ether derived from cyclo-[L-AP4-D-Val] 5 allow direct and stereoselective access to a series of 4-substituted AN derivatives 3 in enantiomerically pure form. (C) 2002 Elsevier Science Ltd. All rights reserved.
One-Pot Synthesis of<i>N</i>-Chloroacetyl 1-Aminoalkyl Phosphonates - Precursors of 4-Phosphono-β-Lactams
作者:Christian V. Stevens、Kristof Moonen
DOI:10.1055/s-2005-918440
日期:——
4-Phosphono-β-lactams are synthesized via a three-step sequence, including final formation of the C3-C4 bond through a phosphorus-stabilized carbanion. The chlorinated precursors can be synthesized via two different methods: a one-pot N-acylation of an aromatic imine followed by addition of a trialkyl phosphite or phosphonylation of a suitable imine followed by N-acylation in a separate reaction step. The former method was preferred because of the ease of the reaction and the good yields obtained.
Diastereoselective Synthesis of 2-Amino-4-phosphonobutanoic Acids by Conjugate Addition of Lithiated Schöllkopf's Bislactim Ethers to Vinylphosphonates
作者:María Ruiz、M. Carmen Fernández、Aniana Díaz、José M. Quintela、Vicente Ojea
DOI:10.1021/jo034707q
日期:2003.10.1
Conjugateadditions of lithiatedbislactimethers derived from cyclo-[Gly-Val] and cyclo-[Ala-Val] to alpha-, beta-, or alpha,beta-substituted vinylphosphonates allow direct and stereoselective access to a variety of 3- or 4-monosubstituted and 2,3-, 2,4-, or 3,4-disubstituted 2-amino-4-phosphonobutanoic acids (AP4 derivatives) in enantiomerically pure form. The relative stereochemistry was assigned
Single-Step Preparation of 1-Hydroxybisphosphonates via Addition of Dialkyl Phosphite Potassium Anions to Acid Chlorides
作者:Rejean Ruel、Jean-Pierre Bouvier、Robert N. Young
DOI:10.1021/jo00121a044
日期:1995.8
The addition reaction between the potassium anion of dialkyl phosphites and acid chlorides at low temperature produced tetraalkyl 1-hydroxybisphosphonates, whereas the corresponding lithium anion gave mostly the rearranged products tetraalkyl phosphono phosphates. The rate of rearrangement was found to be dramatically accelerated by the presence of bulky substituents at the a-position of the acid chloride. Intermediates arising from the addition of dibenzyl phosphite anion rearranged more readily than those obtained from diethyl phosphite anion, but again less so for the potassium anion reagent.
Pudovik,A.N.; Gazizov,T.Kh., Journal of general chemistry of the USSR, 1969, vol. 39, p. 2172 - 2176
作者:Pudovik,A.N.、Gazizov,T.Kh.
DOI:——
日期:——
A study of the reaction of 2-haloacyl halides with trialkyl phosphites. Synthesis of 2-substituted acyl phosphonates