Synlett 2007(15): 2347-2350  
DOI: 10.1055/s-2007-985595
LETTER
© Georg Thieme Verlag Stuttgart · New York

Amberlyst-15 as a Heterogeneous Reusable Catalyst for the Synthesis of α-Hydroxy Phosphonates in Water

Mahmood Tajbakhsh*a, Akbar Heydarib, Mohammad A. Khalilzadehc, Moslem M. Lakouraja, Behi Zameniana, Samad Khaksarb
a Department of Chemistry, Faculty of Basic Science, Mazandaran University, Babolsar 47415, Iran
Fax: +98(11252)42002; e-Mail: tajbaksh@umz.ac.ir;
b Department of Chemistry, Tarbiat Modares University, P. O. Box 14155-4838, Tehran 18716, Iran
c Department of Chemistry, Islamic Azad University, P. O. Box 163, Qaemshahr, Iran
Further Information

Publication History

Received 24 May 2007
Publication Date:
22 August 2007 (online)

Abstract

An efficient and simple synthesis of α-hydroxy phos­phonates has been achieved via reaction of aldehydes with tri­methylphosphite in the presence of Amberlyst-15 in water. The reaction is highly selective with excellent yields under mild con­ditions.

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Typical Procedure A solution of benzaldehyde (0.107 g, 1 mmol), trimethyl-phosphite (0.136 g, 1.1 mmol), and Amberlyst-15 (0.1 g) in H2O (2 mL) was placed in a round-bottomed flask equipped with a magnetic stirrer and was heated at 50 °C. The stirring was continued for 1.5 h. After completion of the reaction as indicated by TLC, the reaction mixture was treated with aq sat. NaHCO3 solution followed by brine and the product was extracted three times with 5 mL CH2Cl2, dried over anhyd MgSO4, and concentrated to give an oily residue, which was crystallized to give 0.216 g (95%) of dimethyl 1-hydroxy-1-phenylmethylphosphonate.
Spectral Data for Selected ProductsDimethyl 1-Hydroxy-1-phenylmethylphosphonate [19] (Table 1, Entry 1)
IR: 3260 (OH) cm-1. 1H NMR (500 MHz, CDCl3): δ = 3.6 (d, J = 10.3 Hz, 3 H), 3.6 (d, J = 10.3 Hz, 3 H), 5.0 (d, 1 H, J = 13.2 Hz), 6.0 (s, OH), 7.3-7.5 (m, 5 H). 13C NMR (125 MHz, CDCl3): δ = 53.7 (d, J CP = 7.5 Hz), 54.2 (d, J CP = 7.5 Hz), 69.1 (d, J CP = 164.0 Hz), 128.8, 129.4, 131.1, 133.8 (d, J CP = 2.9 Hz).
Dimethyl 1-Hydroxy-1-(4-chlorophenyl)methyl-phosphonate [19] (Table 1, Entry 3)
IR: 3290 (OH) cm-1. 1H NMR (500 MHz, CDCl3): δ = 3.6-3.7 (m, 6 H), 5.1 (d, J = 13.4 Hz, 1 H), 6.2 (s, OH), 7.4 (d, J = 8.5 Hz, 2 H), 7.5 (d, J = 8.5 Hz, 2 H). 13C NMR (125 MHz, CDCl3): δ = 53.7 (d, J CP = 7.1 Hz), 54.2 (d, J CP = 7.5 Hz), 69.1 (d, J CP = 161.1 Hz), 128.8, 129.4, 133.1 (d, J CP = 3.9 Hz), 138.2.
Dimethyl 1-Hydroxy-3-phenyl-2-propenylphosphonate [28] (Table 1, Entry 4) IR: 3255 (OH) cm-1. 1H NMR (500 MHz, CDCl3): δ = 3.8 (d, J PH = 10.3 Hz, 3 H), 3.8 (d, J PH = 10.3 Hz, 3 H), 4.7 (s, OH), 6.4 (d, J = 15.9, 6.2 Hz, J PH = 5.6 Hz, 1 H), 6.8 (d, J = 15.6, 1.5 Hz, J PH = 4.9 Hz, 1 H), 7.3-7.2 (m, 3 H), 7.4-7.4 (m, 2 H). 13C NMR (500 MHz, CDCl3): δ = 53.7 (d, J PC = 7.4 Hz), 53.9 (d, J PC = 7.1 Hz), 69.2 (d, J PC = 161.0 Hz), 128.4, 127.8, 126.5, 123.5 (d, J PC = 4.3 Hz), 132.2 (d, J PC = 13.0 Hz), 136.1 (d, J PC = 2.9 Hz).
Dimethyl 1-Hydroxybutylphosphonate [17] (Table 1, Entry 11)
IR: 3312 (OH) cm-1. 1H NMR (90 MHz, CDCl3): δ = 1.0 (t, 3 H), 1.8-1.1 (m, 4 H), 2.7 (m, 1 H), 3.7 (d, 3 J PH = 5.4 Hz, 3 H), 3.8 (d, 3 J PH = 5.4 Hz, 3 H), 3.9 (s, OH). 13C NMR (22.5 MHz, CDCl3): δ = 13.8 (d, 4 J PC = 19.1 Hz, CH3), 19.9 (d, 3 J PC = 11.8 Hz, CH2), 29.0 (d, 2 J PC = 7.4 Hz, CH2), 51.1 (d, 2 J PC = 7.3 Hz, OCH3), 52.2 (d, 2 J PC = 7.3 Hz, OCH3), 56.8 (d, 1 J PC = 136.8 Hz, OCH3).
Dimethyl 1-Hydroxy-2-methylpropylphosphonate [17] (Table 1, Entry 13) IR: 3313 (OH) cm-1. 1H NMR (90 MHz, CDCl3): δ = 0.8 (m, 3 H), 1.9 (m, 1 H), 3.6 (m, 1 H), 3.6 (d, 3 J PH = 4.4 Hz, 3 H), 3.7 (d, 3 J PH = 4.4 Hz, 3 H), 4.8 (s, O H). 13C NMR (22.5 MHz, CDCl3): δ = 17.4 (d, 4 J PC = 7.0 Hz, CH3), 19.4 (d, 3 J PC = 9.5 Hz, CH2), 29.9 (d, 2 J PC = 8.0, CH), 52.4 (2 J PC = 6.5 Hz, OCH3), 52.6 (2 J PC = 6.5 Hz, OCH3), 73.2 (1 J PC = 148.4 Hz, CH).
Dimethyl 1-Hydroxy-1-furylmethylphosphonate [17] (Table 1, Entry 14)
1H NMR (90 MHz, CDCl3): δ = 1.3 (s, OH), 3.7 (d, 3 J PH = 5.8 Hz, 3 H), 3.9 (d, 3 J PH = 5.8 Hz, 3 H), 5.0 (d, 2 J PH = 13.5 Hz, 1 H), 6.4-6.6 (m, 2 H), 7.4 (s, 1 H). 13C NMR (22.5 MHz, CDCl3): δ = 53.6 (d, 2 J PC = 2.7 Hz, OCH3), 53.9 (d, 2 J PC = 2.7 Hz, OCH3), 64.2 (d, 1 J PC = 167.8 Hz, CH), 109.3 (d, 3 J PC = 6.4 Hz, C), 110.7 (s, CH), 142.8 (d, 3 J PC = 1.8 Hz, CH), 149.9 (s, CH).