Categories: C-P Bond Formation >
Synthesis of phosphonates
|α-Hydroxy phosphonates||α-Amino phosphonates|
Using a prevalent palladium catalyst, Pd(PPh3)4, a quantitative cross-coupling of various H-phosphonate diesters with aryl and vinyl halides was achieved in less than 10 min under microwave irradiation. The reactions occurred with retention of configuration at the phosphorus center and in the vinyl moiety.
M. Kalek, A. Ziadi, J. Stawinski, Org. Lett., 2008, 10, 4637-4640.
The reaction of diaryliodonium salts with phosphites in the presence of a base under visible-light illumination provides a large variety of aryl phosphonates. The reaction proceeds smoothly, tolerates various functionalities, and was applied for the synthesis of pharmaceutically relevant compounds.
W. Lecroq, P. Bazille, F. Morlet-Savary, M. Breugst, J. Lalevée, A.-C. Gaumont, S. Lakhdar, Org. Lett., 2018, 20, 4164-4167.
A copper-catalyzed reaction of phosphorus nucleophiles with diaryliodonium salts at room temperature delivers products of a P-C bond formation in high yields within a short reaction time of 10 min. The method can be easily adapted to large-scale preparations. With unsymmetrical iodonium salts, nucleophilic substitution occurs preferentially on the sterically hindered aromatic ring or the more electron-deficient ring.
J. Xu, P. Zhang, Y. Gao, Y. Chen, G. Tang, Y. Zhauo, J. Org. Chem., 2013, 78, 8176-8183.
A broad range of aryl iodides are efficiently coupled with secondary phosphine oxides using low loadings of a catalyst formed in situ from tris(dibenzylideneacetone)dipalladium and Xantphos.
A. J. Bloomfield, S. B. Herzon, Org. Lett., 2012, 14, 4370-4373.
A mild and efficient copper-catalyzed addition of H-phosphonate dialkyl esters to boronic acids gives aryl phosphonates using Cu2O/1,10-phenanthroline as catalytic system.
R. Zhuang, J. Xu, Z. Cai, G. Tang, M. Fang, Y. Zhao, Org. Lett., 2011, 13, 2110-2113.
In an efficient nickel-catalyzed phosphorylation, various phenyl pivalates coupled readily with hydrogen phosphoryl compounds to afford the corresponding aryl phosphonates and aryl phosphine oxides in very good yields.
J. Yang, J. Xiao, T. Chen, L.-B. Han, J. Org. Chem., 2016, 81, 3911-3916.
An efficient metal-free phosphorylation process based on a Sandmeyer-type transformation of arylamines proceeds smoothly at room temperature without the exclusion of moisture or air. This reaction tolerates a wide range of functional groups and affords the phosphorylation products in good yields.
S. Wang, D. Qiu, F. Mo, Y. Zhang, J. Wang, J. Org. Chem., 2016, 81, 11603-11611.
A palladium-catalyzed phosphorylation of aryl mesylates and tosylates exhibits excellent functional group compatibility - including free amino, keto, ester, and amido groups. The mesylated derivatives of biologically active compounds such as 17β-estradiol and 6-hydroxyflavone are applicable substrates too.
W. C. Fu, C. M. So, F. Y. Kwong, Org. Lett., 2015, 17, 5906-5909.
A novel and highly efficient Pd-catalyzed cross-coupling of triarylbismuths with various P(O)-H compounds proceeds smoothly without exclusion of moisture or air and provides valuable arylphosphonates, arylphosphinates, and arylphosphine oxides, with high atom-economy, operational simplicity of the procedure, and good to high yield.
T. Wang, S. Sang, L. Liu, H. Qiao, Y. Gao, Y. Zhao, J. Org. Chem., 2014, 79, 608-617.
An efficient use of arynes for C-P bond construction enables a mild process for the synthesis of aryl-phosphonates, -phosphinates, and -phosphine oxides. The reaction circumvents the relatively harsh reaction conditions using transition-metal-catalyzed P-arylation (Arbuzov/Hirao reaction).
R. A. Dhokale, S. B. Mhaske, Org. Lett., 2013, 15, 2218-2221.
A convenient and practical method for the one-pot, three-component synthesis of terminal vinylphosphonates from aldehydes, nitromethane and trialkylphosphites through a tandem Henry-Michael reaction followed by nitro elimination in the presence of 5-hydroxypentylammonium acetate (5-HPAA) as a task-specific ionic liquid offers good yields of the products under mild reaction conditions.
S. Sobhani, M. Honarmand, Synlett, 2013, 24, 236-240.
A two step procedure involving a transesterification between a diol and diethyl phosphite followed by a palladium-catalyzed coupling of the so-obtained cyclic phosphite with vinyl bromide gave vinyl phosphonates in good yields.
M. Maffei, G. Buono, Tetrahedron, 2003, 59, 8821-8825.
An efficient method allows the synthesis of benzylphosphonate diesters via a palladium(0)-catalyzed cross-coupling reaction between benzyl halides and H-phosphonate diesters, using Pd(OAc)2 as a palladium source and Xantphos as a supporting ligand.
G. Lavéna, J. Stawinski, Synlett, 2009, 225-228.
A Lewis acid-mediated Michaelis-Arbuzov reaction of arylmethyl halides and alcohols with triethyl phosphite at room temperature enables a facile preparation of arylmethyl and heteroarylmethyl phosphonate esters in good yields.
G. G. Rajeshwaran, M. Nandakumar, R. Sureshbabu, A. K. Mohanakrishnan, Org. Lett., 2011, 13, 1270-1273.
A convenient and efficient copper-catalyzed approach for P-arylation of organophosphorus compounds containing P-H uses the commercially available and inexpensive proline and pipecolinic acid as ligands. The method can provide an entry to arylphosphonates, arylphosphinates and arylphosphine oxides.
C. Huang, X. Tang, H. Fu, Y. Jiang, Y. Zhao, J. Org. Chem., 2006, 71, 4951-4955.
A palladium-catalyzed hydrophosphorylation of alkynes with P(O)-H compounds (i.e., H-phosphonates, H-phosphinates, secondary phosphine oxides, and hypophosphinic acid) provides Markovnikov adducts in high yields with high regioselectivity for both aromatic and aliphatic alkynes. The reaction tolerates a wide variety of functional groups.
T. Chen, C.-Q. Zhao, L.-B. Han, J. Am. Chem. Soc., 2018, 140, 3139-3155.
A low-ligated palladium/triphenylphosphane catalytic system in the presence of a catalytic amount of trifluoroacetic acid allows a hydrophosphorylation of terminal and internal alkynes with high isolated yields and excellent regio- and stereoselectivity. The catalytic system permits the formation of diverse alkenylphosphonates utilizing various available H-phosphonates and alkynes.
V. P. Ananikov, L. L. Khemchyan, I. P. Beletskaya, Synlett, 2009, 2375-2381.
Copper-catalyzed aerobic oxidative coupling of terminal alkynes with H-phosphonates affords alkynylphosphonates in high yields.
Y. Gao, G. Wang, L. Chen, P. Xu, Y. Zhao, Y. Zhou, L.-B. Han, J. Am. Chem. Soc., 2009, 131, 7956-7957.
The reaction of various terminal alkynes with dialkyl phosphites in the presence of a catalytic amount of Cu2O provides alkynylphosphonates in very good yields. Reactions are performed under air, in acetonitrile as solvent, and in the absence of base or ligand additives. This simple and mild methodology is compatible with a broad range of functional groups on the starting alkynes and can be scaled up to a gram scale.
Y. Moglie, E. Mascaró, V. Gutierrez, F. Alonso, G. Radivoy, J. Org. Chem., 2016, 81, 1813-1818.
Efficient Cs2CO3-promoted phosphorylations or phosphinylations of various 1,1-dibromo-1-alkenes with readily available trialkyl phosphites, ethyl diphenylphosphinite, or diethyl phenylphosphonite under metal-free conditions provide valuable alkynylphosphonates, -phosphinates, and -phosphine oxides in very good yields.
Y. Wang, J. Gan, L. Liu, H. Yuan, Y. Gao, Y. Liu, Y. Zhao, J. Org. Chem., 2014, 79, 3678-3683.
Stable copper acetylides can be easily activated by oxidation with oxygen in the presence of simple nitrogen ligands such as TMEDA or imidazole derivatives. Upon activation, these nucleophilic species undergo a formal umpolung and can transfer their alkyne subunit to a wide range of heteronucleophiles under especially mild conditions providing ynamides, ynimines, and alkynylphosphonates on a multigram scale.
C. Theunissen, M. Lecomte, K. Jouvin, A. Laouiti, C. Guissart, J. Heimburger, E. Loire, G. Evano, Synthesis, 2014, 46, 1157-1166.
A new, efficient method based on a palladium(0)-catalyzed reaction of propargylic derivatives with various phosphorus nucleophiles produces allenylphosphonates and their analogues with defined stereochemistry in the allenic and the phosphonate moiety.
M. Kalek, T. Johansson, M. Jezowska, J. Stawinski, Org. Lett., 2010, 12, 4702-4704.
When treated with a radical initiator selenophosphates, selenophosphorodithioates, selenophosphorothioates and selenophosphorotrithioates undergo homolytic cleavage of the P-Se bond to generate radicals. Addition onto electron-rich and electron-poor alkenes in the presence of a hydrogen donor delivers the expected adducts in good yields.
C. Lopin, G. Gouhier, A. Gautier, S. R. Piettre, J. Org. Chem., 2003, 68, 9916-9923.
A Mn(OAc)3-promoted oxidative phosphonylation of N,N-dimethylenaminones with H-phosphonates provides functionalized β-ketophosphonates in very good yields under mild reaction conditions. This method offers operational simplicity, broad substrate scope, and large-scale preparation.
P. Zhou, B. Hu, L. Li, K. Rao, J. Yang, F. Yu, J. Org. Chem., 2017, 82, 13268-13276.
A deprotonative cross-coupling process (DCCP) enables a new synthetic route to access diarylmethyl phosphonates via introduction of aromatic groups on benzylic phosphonates. A catalytic system based on Pd(OAc)2/CataCXium A allows a reaction between benzyl diisopropyl phosphonate derivatives and aryl bromides in very good isolated yields.
S. Montel, L. Raffier, Y. He, P. J. Walsh, Org. Lett., 2014, 16, 1446-1449.
The N-heterocyclic carbene derived from N-mesitylimidazolium chloride was an effective catalyst for a Stetter reaction of aromatic aldehydes with vinylphosphonates providing γ-ketophosphonates in good yields.
A. Patra, A. Bhunia, A. T. Biju, Org. Lett., 2014, 16, 4798-4801.
The use of lithiated methyl α-(trimethylsilyl)methylphosphonate as mild lithiated phosphonate reagent enables a highly chemoselective synthesis of β-ketophosphonates from pentafluorophenyl esters in high yield. The reaction tolerates for example the presence of unactivated esters.
S. Specklin, J. Cossy, J. Org. Chem., 2015, 80, 3302-3308.
The use of a palladium(II) acetate-organophosphine catalyst system enables an efficient coupling of (1-bromovinyl)phosphonates with aryl boronic acids. A wide range of (1-arylvinyl)phosphonates were prepared in very good yields. The protocol can be effectively scaled up and even allows the use of a (1-chlorovinyl)phosphonate as the electrophilic coupling partner.
Y. Fang, L. Zhang, X. Jin, J. Li, M. Yuan, R. Li, H. Gao, J. Fang, Y. Liu, Synlett, 2015, 26, 980-984.
α-Phosphonovinyl tosylates can be coupled efficiently with a range of arylboronic acids to provide α-arylethenylphosphonates. The unprecedented procedure exhibits excellent functional group tolerance, giving the terminal vinylphosphonates in good to excellent isolated yields under mild reaction conditions.
Y. Fang, L. Zhang, J. Li, X. Jin, M. Yuan, R. Li, R. Wu, J. Fang, Org. Lett., 2015, 17, 798-801.
Various vinyl phosphonates were prepared by the regioselective addition reaction of monoesters of phosphonic acid to alkynes in the presence of Hg(OAc)2/BF3·OEt2.
A. Y. Peng, Y. X. Ding, Synthesis, 2003, 205-208.
An efficient Cu(I)-catalyzed coupling of diazophosphonates with terminal alkynes provides allenylphosphonates using inexpensive CuI as the catalyst under mild conditions.
C. Wu, F. Ye, G. Wu, S. Xu, G. Deng, Y. Zhang, J. Wang, Synthesis, 2016, 48, 751-760.
A mild, high-yielding and general procedure for the preparation of β-ketophosphonates by condensation of esters and phosphonates provides products in high yields within minutes at 0°C. The reaction procedure is operationally simple and amenable to large-scale preparations.
K. M. Maloney, J. Y. L. Chung, J. Org. Chem., 2009, 74, 7574-7576.