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2 (12 mL) was then added and the mixture was stirred under ethylene at 20°C during 5 d. The volatiles were eliminated under reduced pressure and the residue was purified by flash chromatography (5% EtOAc in hexane) to give rac-cis-22 (100 mg, 25%) and rac-trans-22 (100 mg, 25%) in order effractions eluted.
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2 (12 mL) was then added and the mixture was stirred under ethylene at 20°C during 5 d. The volatiles were eliminated under reduced pressure and the residue was purified by flash chromatography (5% EtOAc in hexane) to give rac-cis-22 (100 mg, 25%) and rac-trans-22 (100 mg, 25%) in order effractions eluted.
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41
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34447550761
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Selected physico-chemical data for compound cis-12: Rf, 0.50 (5% EtOAc-hexane, 1H NMR (300 MHz, CDCl3, δ, 7.71 (m, 4 H, Ph, 7.45 (m, 6 H, Ph, 6.48 (dd, 1 H, J, 12, 18 Hz, CH, 6.18 (s, 1 H, H3, 5.87 (s, 1 H, H5, 5.46 (d, 1 H, J, 18 Hz, CH, 5.23 (d, 1 H, J, 12 Hz, CH, 4.80 (m, 1 H, J, 1 Hz, H2, 3.68 (m, 4 H, OCH2CH3, CH2OSi, 1.23 (t, 3 H, J, 8 Hz, CH3, 1.06 (s, 9 H, 3 CH3) ppm. 13C NMR (75 MHz, CDCl3, δ, 138.9 (C4, 136.0 (Ph, 135.9 (Ph, 133.9 (C3, 133.8 (Ph, 130.4, CH, 128.1 (Ph, 118.0, CH2, 107.6 (C5, 85.7 (C2, 67.6 (CH 2OSi, 62.6 (OCH2, 27.2 (CH3 of t-Bu, 19.6(Cq of t-Bu, 15.8 (CH3) ppm. ESI-HRMS: m/z calcd [M, Na
-
+]: 431.2018; found: 431.2034.
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-
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42
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34447509922
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Selected physico-chemical data for compound trans-12: Rf, 0.20 (5% MeOH-CH2Cl2, 1H NMR (300 MHz, CDCl3, δ, 7.65 (m, 4 H, Ph, 7.38 (m, 6 H, Ph, 6.43 (m, 1 H, J, 12, 18Hz, CH, 5.98 (s, 1 H, H 3, 5.96 (d, 1 H, J, 4 Hz, H5, 5.43 (d, 1 H, J, 18, CH, 5.24 (d, 1 H, J, 12 Hz, CH, 4.90 (m, 1 H, H 2, 3.72 (m, 4 H, OCH2CH3, CH 2OSi, 1.26 (t, 3 H, J, 8 Hz, CH3, 1.04 (s, 9 H, 3 CH3) ppm. 13C NMR (75 MHz, CDCl3, δ, 138.8 (C4, 136.0 (Ph, 133.9 (Ph, 130.6 (C3, 130.0 (Ph, 129.0, CH, 128.1 (Ph, 118.0, CH2, 107.6 (C5, 85.6 (C2, 66.6 (CH2OSi, 62.1 (OCH2, 27.2 (CH3 of t-Bu, 19.6 (Cq of t-Bu, 15.8 CH 3, ESI-HRMS: m/z
-
+]: 431.2018; found: 431.2025.
-
-
-
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43
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0000400927
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Barfield, M.; Spear, R. J.; Sternhell, S. J. Am. Chem. Soc. 1975, 97, 5160.
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Sternhell, S.3
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