Synthesis and Herbicidal Activities of 2-Methylpropan-2-Aminium Methyl 1-(Substituted Phenoxyacetoxy) Alkylphosphonates
作者:Ling Gao、Xiaoyan Deng、Xiaosong Tan、Qingwu Long、Hao Peng、Hongwu He
DOI:10.1080/10426507.2012.736101
日期:2013.8.1
2-methylpropan-2-aminium methyl1-(substitutedphenoxyacetoxy) alkylphosphonates were selectively synthesized by reacting the corresponding dimethyl 1-(substitutedphenoxyacetoxy)alkylphosphonates with an excess of 2-methylpropan-2-amine. All the title compounds were identified by IR, 1H NMR, and 31P NMR, some of them were further analyzed by 19F NMR and 13C NMR. Their herbicidal activity was investigated and
The Preparation of Dimethyl α -Hydroxyphosphonates and the Chemical Shift Non-Equivalence of Their Diastereotopic Methyl Ester Groups
作者:Harry R. Hudson、Ramon O. Yusuf、Ray W. Matthews
DOI:10.1080/10426500701690905
日期:2008.6.9
alkanals, aryl aldehydes (or aryl methyl ketones), furfuraldehyde, and 2- or 3-thiophenecarboxaldehyde, respectively, thus confirming the general utility of this synthetic procedure. The 1H and 13C nmr spectra of the products exhibit characteristic chemical shift non-equivalence of the diastereotopic methyl ester groups, for which a tentative order of non-equivalence is reported and discussed.
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).
SIMPLE AND IMPROVED PREPARATION OF α-OXOPHOSPHONATE MONOLITHIUM SALTS
作者:Tao Wang、Hong Wu He
DOI:10.1080/10426500490474941
日期:2004.10.1
Some α-OxoPhosphonate monolithium salts were synthesized by a facile one-step procedure. In this way, α-(2,4-dichlorophenoxyacetoxy)alkyl phosphonic acid dimethyl esters 5 can be transformed into the corresponding phosophonate monolithium salts 6 without influence on the carboxylic ester group under mild conditions.