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All the nitrones were prepared according to the procedure described in: Bhattacharya, G. PhD Thesis; Indian Institute of Technology: Kharagpur, India, 1997.
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(a) All the nitrones were prepared according to the procedure described in: Bhattacharya, G. PhD Thesis; Indian Institute of Technology: Kharagpur, India, 1997.
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34347353847
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However, a general method of preparation is given below along with the spectroscopic data of some representative compounds: To a solution of EtOH (30 mL) and H2O (20 mL) nitrobenzene or p-methoxynitrobenzene (50 mmol, benzaldehyde (or p-methoxybenzaldehyde or furfural or thienyl aldehyde; 50 mmol) and Zn dust (5 gm) were placed. The mixture was stirred at 5°C. AcOH (30 mL) was slowly added in a span of 20 min. The reaction mixture was stirred for an additional 1.5 h at -5°C. The mixture was filtered and the residue was washed with EtOAc. The filtrate was concentrated to 10 mL. H2O was added and the products were extracted with EtOAc. The organic layer was washed with NaHCO3, brine and dried over Na 2SO4. The solvent was evaporated under vacuo and the crude mass was subjected to silica gel column chromatography. The products were eluted with hexane-EtOAc mixture. Compound 2a: 1H NMR: δ
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1H NMR: δ = 7.15 (dd, J = 4.0, 4.8 Hz, 1 H), 7.39-7.56 (m, 5 H), 7.76-7.81 (m, 2 H), 8.46 (s, 1 H).
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34347347744
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General Procedure: To a solution of CuSO4· 5H2O (1 mmol) in degassed H2O (10 mL, sodium ascorbate (2 mmol) was added and the mixture was stirred for 30 min at r.t, solution X, In another flask, to a solution of propargyl alcohol-3-butyn-2-ol-propargyl nucleobase (2 mmol) in DMF-MeCN (3 mL) under argon at 0°C, Et3N (2 mmol) was added and the mixture was stirred for 30 min (solution Y, Solution Y was added dropwise to the solution X at r.t. after which a 2 mL DMF or MeCN solution of the nitrones12 2a-2d (1 mmol) was added slowly over 10 min. The reaction was stirred at r.t. for 16-25 h. It was then diluted with H2O and filtered through celite. The celite bed was washed with EtOAc. The combined filtrate and washings were extracted with EtOAc. The organic layer was washed with NH4Cl, H2O and brine and dried over Na2SO4 and evaporated. The residue, obtai
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14 in quantitative yield.
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0035157940
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The spectral data for all the known compounds have been reported: (a) Basak, A.; Rudra, K. R.; Ghosh, S. C.; Bhattacharya, G. Indian J. Chem., Sect. B: Org. Chem. Incl. Med. Chem. 2001, 40, 974.
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The spectral data for all the known compounds have been reported: (a) Basak, A.; Rudra, K. R.; Ghosh, S. C.; Bhattacharya, G. Indian J. Chem., Sect. B: Org. Chem. Incl. Med. Chem. 2001, 40, 974.
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PhD Thesis; Indian Institute of Technology: Kharagpur, India
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(b) Ghosh, S. C. PhD Thesis; Indian Institute of Technology: Kharagpur, India, 2005.
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(2005)
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Ghosh, S.C.1
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For the new compounds, the spectral data are given below: β-Lactam 8j: 1H NMR: δ, 1.85 (s, 3 H, 3.90 (dd, J, 7.6, 14.4 Hz, 1 H, 3.98 (dd, J, 7.6, 14.4 Hz, 1 H, 4.14 (m, 1 H, 5.26 (d, J, 5.6 Hz, 1 H, 6.50 (br s, 2 H, 7.08-7.48 (m, 7 H, 8.64 (br s, 1 H, 13C NMR: δ, 12.18, 45.51, 50.95, 52.54, 110.41, 111.16, 111.26, 116.77, 124.45, 129.13, 137.09, 140.79, 143.60, 147.73, 150.60, 164.02, 164.29. MS (ES, m/z, 368 [MH, 390 [MNa, β-Lactam 7j: 1H NMR: δ, 1.84 (s, 3 H, 3.76 (m, 1 H, 4.15 (dd, J, 5.6, 14.8 Hz, 1 H, 4.29 (dd, J, 6.6, 14.6 Hz, 1 H, 5.09 (d, J, 2.4 Hz, 1 H, 6.35 (d, J, 2.8 Hz, 1 H, 6.50 (m, 1 H, 7.06-7.48 (m, 7 H, 9.06 (br s, 1 H, 13C NMR: δ, 12.23, 45.75, 52.48, 55.86, 110.31, 110.71, 111.32, 116.88, 124.46, 129.10, 137.10, 140.62, 143.43, 148.71, 151.59, 164.08, 164.61. MS ES
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+].
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