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4 and concentrated at reduced pressure to furnish the crude product, which was purified by silica gel chromatography (30% EtOAc in hexanes).
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4 and concentrated at reduced pressure to furnish the crude product, which was purified by silica gel chromatography (30% EtOAc in hexanes).
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19
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34247197506
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All the compounds gave satisfactory spectroscopic data. Data for selected compounds are given below: 10: 1H NMR (CDCl3, 300 MHz, δ 7.28-7.40 (m, 5H, 6.72 (d, J, 8.1, 1H, 6.65 (td, J, 11.7, 1.7, 2H, 5.91 (s, 2H, 4.65 (dd, J, 7.8,5.4, 1H, 2.54-2.72 (m, 2H, 2.28 (sl, 1H, 1.91-2.15 (m, 2H, 13C NMR (CDC13, 75 MHz, δ 147.4, 145.4, 144.5, 135.5, 128.4, 127.5, 125.8, 121.0, 108.8, 108.0, 100.6, 73.5, 40.6, 31.6. 14: 1H NMR (CDC13, 300 MHz, δ 7.24-7.40 (m, 7H, 6.59-7.03 (m, 1H, 6.58-6.63 (m, 1H, 4.64-4.68 (dd, J, 7.8, 5.4, 1H, 2.77 (sl, 1H, 2.56-2.69 (m, 2H, 1.91-2.19 (m, 2H, 13C NMR (CDCl3, 75 MHz, δ 144.6, 144.1, 131.8, 129.2, 128.43, 127.5, 125.9, 115.3, 73.8, 40.7, 31.1. 16: 1H NMR (CDCl3, 300 MHz, δ 7.12-7.28 (m, 7H, 6.80-6.85 (d, 2H, 4.55 dd, J, 7.5, 5
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3, 75 MHz): δ 200.2, 142.1, 136.9, 132.8, 128.4, 128.3, 128.2, 127.9, 125.6, 38.3, 35.6, 30.9,23.8.
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0034742834
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b) Pitts, M. R.; Harrison, J. R.; Moody, C. J. J. Chem. Soc., Perkin Trans. 1 2001, 955.
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Pitts, M.R.1
Harrison, J.R.2
Moody, C.J.3
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