Enantioseparation of α-Hydroxyallylphosphonates and Phosphonoallylic Carbonate Derivatives on Chiral Stationary Phases Using Sequential UV, Polarimetric, and Refractive Index Detection
作者:Bruce C. Hamper、Michael P. Mannino、Melissa E. Mueller、Liam T. Harrison、Christopher D. Spilling
DOI:10.1002/chir.22627
日期:2016.9
the separation efficiency and elution order of enantiomeric α‐hydroxyallyl phosphonates and their carbonate derivatives on commercially available polysaccharide AS, ad, OD, IC‐3, and Whelk‐O 1 CSPs. In general, the α‐hydroxyallyl phosphonates were resolved on the AS‐H CSP, whereas the carbonate derivatives 1b and 2b were preferentially resolved on the ad‐H CSP. The impact of aryl substitution on the
Biocatalytic Promiscuity of Lipases in Carbon‐Phosphorus Bond Formation
作者:Dominik Koszelewski、Ryszard Ostaszewski
DOI:10.1002/cctc.201900397
日期:2019.5.20
A promiscuous lipase‐catalyzed carbon‐phosphorus bondformation is presented. The developed enzymatic Pudovik‐Abramov reaction of various aromatic and aliphatic aldehydes with dialkyl phosphonates provides biologically and pharmacologically relevant α‐hydroxy phosphonates with the yields from 11 % to 85 %. The developed protocol proceeds in the presence of porcine pancreas lipase under environmentally
Kinetic resolution of racemic α-hydroxyphosphonates by asymmetric esterification using achiral carboxylic acids with pivalic anhydride and a chiral acyl-transfer catalyst
作者:Isamu Shiina、Keisuke Ono、Takayoshi Nakahara
DOI:10.1039/c3cc44293d
日期:——
A practical protocol is developed to directly provide chiral alpha-acyloxyphosphonates and alpha-hydroxyphosphonates from (+/-)-alpha-hydroxyphosphonates utilizing the transacylation process to generate the mixed anhydrides from acid components and pivalic anhydride in the presence of organocatalysts (s-value = 33-518).
Organocatalytic synthesis of α-hydroxy and α-aminophosphonates
作者:Seyed Mohammad Vahdat、Robabeh Baharfar、Mahmood Tajbakhsh、Akbar Heydari、Seyed Meysam Baghbanian、Samad Khaksar
DOI:10.1016/j.tetlet.2008.08.094
日期:2008.11
A new and highly flexible procedure is described for the synthesis of α-amino- and α-hydroxy phosphonates. In the presence of a catalytic amount of oxalic acid (10 mol %), trimethyl phosphite reacts with aldehydes or imines (generated in situ from an aldehyde and an amine) to yield the corresponding coupled products in good yield.
Nonenzymatic kinetic resolution of racemic α-hydroxyalkanephosphonates with chiral copper catalyst
作者:Yosuke Demizu、Atsushi Moriyama、Osamu Onomura
DOI:10.1016/j.tetlet.2009.07.003
日期:2009.9
Kinetic resolution of alpha-hydroxyalkanephosphonates was efficiently performed by benzoylation in the presence of copper(II) triflate and (R,R)-Ph-BOX as a catalyst with excellent s value of up to 286. (C) 2009 Elsevier Ltd. All rights reserved.