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4, and concentrated in vacuum. The crude product was purified by chromatography on silica gel (PE-EtOAc, 4:1) to provide pure compound 2a (95%).
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4, and concentrated in vacuum. The crude product was purified by chromatography on silica gel (PE-EtOAc, 4:1) to provide pure compound 2a (95%).
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4, and concentrated in vacuum. The crude product was purified by chromatography on silica gel (PE-EtOAc, 10:1) to provide pure compound 7a (85%).
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4, and concentrated in vacuum. The crude product was purified by chromatography on silica gel (PE-EtOAc, 10:1) to provide pure compound 7a (85%).
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Spectroscopic Data for Products: Compound 2a: 1H NMR (400 MHz, CDCl3, δ, 0.91-0.95 (t, J, 14.4 Hz, 3 H, 1.33-1.49 (m, 3 H, 1.56-1.65 (m, 1 H, 1.79-1.88 (m, 1 H, 2.15-2.21 (m, 1 H, 2.48 (s, 3 H, 4.43-4.46 (m, 1 H, 7.41-7.44 (d, J, 8.0 Hz, 2 H, 7.85-7.87 (d, J, 8.4 Hz, 2 H, 13C NMR (100 MHz, CDCl 3, δ, 13.7, 21.8, 21.8, 27.4, 28.2, 73.0, 130.1, 130.2, 131.2, 146.6, 164.9. Compound 2b: 1H NMR (400 MHz, CDCl 3, δ, 1.74-1.75 (d, J, 6.8 Hz, 3 H, 2.50 (s, 3 H, 4.60-4.65 (m, 1 H, 7.44-7.46 (d, J, 8.0 Hz, 2 H, 7.87-7.89 (d, J, 8.0 Hz, 2 H, 13C NMR (100 MHz, CDCl3, δ, 15.5, 21.8, 68.3, 130.2, 130.7, 146.7, 164.6. Compound 2c: 1H NMR (400 MHz, CDCl3, δ, 1.16-1.19 (t, J, 15.2 Hz, 3 H, 1.84-1.92 (m, 1 H, 2.23-2.29 (m, 1 H, 2.49 (s, 3 H, 4.38-4.42 m
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