- Zinc-catalyzed transformation of diarylphosphoryl azides to diarylphosphate esters and amides
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We have developed a facile and efficient procedure for the synthesis of diarylphosphate esters and amides. Using Zn(acac)2 as the catalyst, the reaction of diarylphosphoryl azides with aliphatic alcohols and phenols through an unusual P?N bond cleavage provided a number of diarylphosphate esters in good yields (22 examples, up to 94%). Additionally, various diarylphosphate amides were obtained from the corresponding amines in excellent yields as well (8 examples, up to 96%).
- Ying, Jun,Gao, Qian,Wu, Xiao-Feng
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p. 1540 - 1543
(2020/04/15)
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- Recyclable copper catalyst on chitosan for facile preparation of alkyl/aryl mixed phosphates via deaminated esterification between diphenylphosphoryl azides and aliphatic alcohols
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An efficient methodology was established for the preparation of alkyl/aryl mixed phosphates under aerobic conditions promoted by a easily recoverable heterogeneous catalyst. This highly active copper catalyst was obtained by directly mixing of copper precursor with chitosan solution, followed by a simple work-up process. In this catalytic system, different phosphoryl azides and aliphatic alcohols were employed to generate desired products in moderate to excellent yields with good functional group tolerance. This protocol provided a practical application of the chitosan supported heterogeneous copper catalyst towards a novel P–O bond formation.
- Hao, Qingqing,Hong, Qian,Jiao, Lin-Yu,Li, Zhuo,Liu, Shanshan,Ma, Xiao-Xun,Ning, Zi-Hui,Sun, Ming,Xu, Long,Zhang, Ze
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- Method for catalytically synthesizing phosphoric acid mixed ester compound by using chitosan-loaded copper
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The invention relates to a method for synthesizing a phosphoric acid mixed ester compound under the catalysis of chitosan-loaded copper. The preparation method comprises the following steps of: sequentially adding an azido phosphate compound, a chitosan-l
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Paragraph 0076-0080
(2020/10/19)
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- SN2 Reaction of Diarylmethyl Anions at Secondary Alkyl and Cycloalkyl Carbons
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The substitution reaction of the diethyl allylic and propargylic phosphates with Ar2CH anions was applied to sec-alkyl phosphates to compare reactivity and stereoselectivity. However, the substitution took place on the ethyl carbon of the diethyl phosphate group. We then found that the diphenyl phosphate leaving group ((PhO)2PO2) was suited for the substitution at the sec-alkyl carbon. Enantioenriched diphenyl sec-alkyl phosphates with different substituents (Me, Et, iPr) on the vicinal position underwent the substitution reaction with almost complete inversion (>99% enantiospecificity). The substitution reactions of cyclohexyl phosphates possessing cis or trans substituents (Me and/or tBu) at the C4, C3, and C2 positions of the cyclohexane ring were also studied to observe the difference in reactivity among the cis and trans isomers. A transition-state model with the phosphate leaving group ((PhO)2PO2) in the axial position was proposed to explain the difference. This model was supported by computational calculation of the virtual substitution reaction of the structurally simpler “dimethyl” cyclohexyl phosphates (leaving group = (MeO)2PO2) with MeLi. Furthermore, the calculation unexpectedly indicated higher propensity of (PhO)2PO2 as a leaving reactivity than alkyl phosphate groups such as (MeO)2PO2 and (iPrO)2PO2.
- Shinohara, Riku,Ogawa, Narihito,Kawashima, Hidehisa,Wada, Kyohei,Saito, Shun,Yamazaki, Takashi,Kobayashi, Yuichi
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p. 1461 - 1478
(2019/01/25)
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- Copper catalyzed synthesis of aryl/alkyl mixed phosphates from diphenylphosphoryl azides and aliphatic alcohols under mild conditions
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An efficient and convenient one-pot protocol is developed to prepare aryl/alkyl mixed phosphates in the presence of copper catalyst under exceptionally mild conditions. A series of versatile, ubiquitous, and inexpensive phosphoryl azides and aliphatic alcohols are combined for the first time ever. Diphenylphosphoryl azide is employed as novel phosphors reagent through an unexpected cleavage of P[sbnd]N bond. The transformation is advantageous with respect to a broad of functional group compatibility and different esterification products are isolated in good to excellent results. This new catalytic system represents a superior platform towards a mild, operationally simple, practical, and scalability alternative to access target molecules. Furthermore, a plausible mechanism is proposed based on insightful mechanistic studies.
- Jiao, Lin-Yu,Zhang, Ze,Yin, Xiao-Mei,Li, Zhuo,Ma, Xiao-Xun
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- Synthesis method of copper-catalyzed phosphate mixed ester compound
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The invention provides a synthesis method of a copper-catalyzed phosphate mixed ester compound. The synthesis method comprises the steps that a phosphate ester azide compound and fatty alcohol are mixed, then a copper catalyst is added, alkali is added, reaction is conducted at the temperature of 20-100 DEG C for 3-24 h, and the phosphate mixed ester compound is obtained through aftertreatment. According to the synthesis method, the phosphate ester azide compound and the fatty alcohol are adopted to synthesize the phosphate mixed ester compound for the first time, in the synthesis process, only the copper catalyst and the alkali with the catalytic dosage are needed to be added, operation is easy, the defect of needing inert gas protection is overcome, and the synthesis method is novel andefficient.
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Paragraph 0061-0065
(2019/10/17)
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- Organocatalytic phosphorylation of alcohols using pyridine- N -oxide
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Phosphorylation of alcohols by phosphoryl chlorides catalysed by pyridine-N-oxide is reported. The utility of this method is demonstrated through phosphorylation of primary, secondary and a tertiary alcohol as well as phenols under mild reaction conditions and with low catalyst loading (5 mol%).
- Murray, James I.,Woscholski, Rudiger,Spivey, Alan C.
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supporting information
p. 985 - 990
(2015/04/27)
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- Substitution- and elimination-free phosphorylation of functionalized alcohols catalyzed by oxidomolybdenum tetrachloride
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Among 14 oxidometallic species examined for catalytic phosphorylation of the tested alcohols, oxidomolybdenum tetrachloride (MoOCl4) was found to be the most efficient with a negligible background reaction mediated by triethylamine (Et3N). The new catalytic protocol can be applied to the chemoselective phosphorylations of primary, secondary and tertiary alcohols as well as the substitution-free phosphorylations of allylic, propargylic, and benzylic alcohols. Functionalized alcohols bearing acetonide, tetrahydropyranyl ether, tert-butyldimethylsilyl ether, or ester group are also amenable to the new catalytic protocol. The most difficult scenarios involve substitution-free phosphorylations of 1-phenylethanol and 1-(2-naphthyl)ethanol which can be effected in 95 and 90% yields, respectively. ESI-MS, IR, 1H, and 31P NMR spectroscopic analyses of the reaction progress suggest the intermediacy of an alkoxyoxidomolybdenum trichloride-triethylamine adduct such as [(RO)Mo(O)Cl3-Et3N] to be responsible for the catalytic turnover.
- Liu, Cheng-Yuan,Pawar, Vijay D.,Kao, Jun-Qi,Chen, Chien-Tien
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experimental part
p. 188 - 194
(2010/07/03)
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- An efficient method for the esterification of phosphonic and phosphoric acids using silica chloride
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Silica chloride is used as an effective heterogeneous catalyst for the rapid esterification of alkyl/aryl phosphonic/phosphoric acids to their corresponding alkyl/aryl phosphonates/phosphates under mild conditions with quantitative yields.
- Sathe, Manisha,Gupta, Arvind K.,Kaushik
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p. 3107 - 3109
(2007/10/03)
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- Surface-mediated solid phase reactions: A simple, efficient and base-free synthesis of phosphonates and phosphates on Al2O3
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Al2O3-supported solvent free condensation of alkylphosphonic dichlorides with alcohols at room temperature yielded phosphorus esters in excellent yields.
- Acharya, Jyotiranjan,Shakya, Purushottam D.,Pardasani, Deepak,Palit, Meehir,Dubey, Devendra K.,Gupta, Arvind K.
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p. 194 - 196
(2007/10/03)
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- Catalytic phosphorylation using a bifunctional imidazole derived nucleophilic catalyst
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A bifunctional catalyst containing a polyether backbone and a nucleophilic imidazole moiety has been prepared that demonstrates cooperative catalysis in the presence of added group 1 and 2 salts for the phosphorylation of alcohols. The Royal Society of Chemistry 2005.
- Jones, Simon,Northen, Julian,Rolfe, Alan
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p. 3832 - 3834
(2007/10/03)
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- Phosphorylation of alcohols with N-phosphoryl oxazolidinones employing copper(II) triflate catalysis
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(Chemical Equation Presented) Phosphoryl transfer from N-phosphoryl 5,5-diphenyl oxazolidinone is efficiently catalyzed by copper(II) triflate. The utility of this method has been demonstrated in the phosphorylation of representative primary, secondary, tertiary, phenolic, and allylic alcohols. These reaction conditions are significantly milder than employing alkoxides and allow the phosphorylation of biologically relevant molecules.
- Jones, Simon,Smanmoo, Chaiwat
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p. 3271 - 3274
(2007/10/03)
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- N-Phosphoryl oxazolidinones as effective phosphorylating agents
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A number of N-phosphoryl oxazolidinones have been prepared and evaluated, the best being 5,5-diphenyl oxazolidinones, the utility of which was demonstrated in the phosphorylation of a number of representative primary, secondary, tertiary, and phenolic alcohols.
- Jones, Simon,Smanmoo, Chaiwat
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p. 1585 - 1588
(2007/10/03)
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- An improved method for Lewis acid catalyzed phosphoryl transfer with Ti(t-BuO)4
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Several inorganic esters have been evaluated as phosphoryl transfer catalysts. Of these, Ti(t-BuO)4 was found to be the most effective catalyst giving excellent yields of the desired phosphate esters. The loading of the catalyst could be reduced to a little as 5 mol % for a majority of substrates with no loss in the yield of product. This methodology is significantly more versatile than using TiCl4 and is suitable for the phosphorylation of more complex carbohydrates and molecules of biological interest.
- Jones, Simon,Selitsianos, Dimitrios,Thompson, Kate J.,Toms, Steven M.
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p. 5211 - 5216
(2007/10/03)
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- A simple, general and improved procedure for phosphorylation of alcohols catalyzed by indium(III) chloride
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A general and efficient procedure has been developed for the preparation of dialkyl phosphate esters by indium(III) chloride catalyzed phosphoryl transfer from diethyl and diphenyl chlorophosphate to a variety of alcohols and phenols in THF in presence of triethylamine.
- Ranu, Brindaban C.,Das, Arijit
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p. 1063 - 1064
(2007/10/03)
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- A simple and effective method for phosphoryl transfer using TiCl4 catalysis
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(graph presented) A number of Lewis acids have been evaluated as catalysts for the phosphoryl transfer, the most efficient being TiCl4. Application of this methodology to the phosphorylation of a number of representative target alcohols is presented.
- Jones, Simon,Selitsianos, Dimitrios
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p. 3671 - 3673
(2007/10/03)
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- 3-Phosphono-2-(N-cyanoimino)thiazolidine derivatives, new phosphorylating agents for alcohols
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We have developed new phosphorylating agents, 3-phosphono-2-(N-cyanoimino)-thiazolidine derivatives (3-phosphono-NCTs), which were readily synthesized by phosphorylation of NCT, and transformed primary and secondary alcohols into phosphates in good yield. The transfer of three kinds of dialkylphosphono groups [(PhO)2P(O)-, (EtO)2P(O)-, (Cl3CCH2O)2P(O)-] proceeded in excellent yields. Selective phosphorylation of various alcohols was also accomplished.
- Maezaki, Naoyoshi,Furusawa, Akemi,Hirose, Yuki,Uchida, Shuji,Tanaka, Tetsuaki
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p. 3493 - 3498
(2007/10/03)
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- Dehydration of secondary alcohols via thermolysis of in situ generated alkyl diphenyl phosphates: An inexpensive and environmentally compatible method for the preparation of alkenes
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Secondary alcohols are converted into diphenyl phosphate esters by the action of triphenyl phosphate or diphenyl phosphorochloridate in high-boiling, water-miscible solvents in the presence of base. The alkyl diphenyl phosphates undergo thermolysis to afford high yields of alkenes which distill from the reaction mixtures. Purification of the products is achieved by extraction with dilute sulfuric acid which removes traces of solvent and base that may have codistilled. The ratios of 2- (14) and 3-menthene (15), obtained from menthol (13) and neomenthol (16), and the formation of rearranged alkenes by 1,2-shifts from 3, 6, and 3,3-dimethylbutan-2-ol are consistent with ionic intermediates of the elimination reaction. The novel dehydration method offers distinct and important advantages over the existing methods.
- Quast,Dietz
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p. 1300 - 1304
(2007/10/02)
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