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26
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1542594165
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note
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13C NMR, IR, UV, and MS) data were obtained for all new compounds.
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35348862141
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1542384307
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note
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General Experimental Procedure for the synthesis of 5,6: A mixture of the N-protected quinolone 1,2 (1.00 mmol) and TIPSOTf (0.54 mL, 2.00 mmol) was treated under argon without stirring for 1 h at rt. Dichloromethane (5 mL), 2,6-lutidine (0.22 mL, 2.00 mmol) and the appropriate organometallic species (2.00-5.00 equiv.) were added at the temp. given in Scheme 1. The Grignard reagents were added as 1 M solutions in THF. The solution was stirred until completion (TLC) and quenched with ice (5 g). After extraction with dichloromethane (2 × 10 mL) the combined organic layers were dried over sodium sulfate, the solvent was removed in vacuo and the residue purified by flash chromatography on silica gel.
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30
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1542594162
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note
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5).
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31
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1542489500
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note
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br, J = 8.0 Hz, 1H, 8-H), 8.04 (ddd, J = 0.5 Hz, J = 2.0 Hz, J = 8.0 Hz, 1H, 5-H).
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0029021623
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(a) Evans, P. A.; Longmire, J. M.; Modi, D. P. Tetrahedron Lett. 1995, 36, 3985.
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Evans, P.A.1
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Modi, D.P.3
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0029591656
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(b) Comins, D. L.; Joseph, S. P.; Peters, D. D. Tetrahedron Lett. 1995, 36, 9449.
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(c) Larock, R. C.; Hightower, T. R.; Kraus, G. A.; Hahn, P.; Zheng, D. Tetrahedron Lett. 1995, 36, 2423.
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33746494993
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(g) Friedrich, E.; Lutz, W. Angew. Chem. 1977, 89, 426; Angew. Chem., Int. Ed. Engl. 1977, 16, 413.
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Sullivan, D.F.4
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1542699063
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note
-
General Experimental Procedure for the synthesis of 8: The appropriate silyl enol ether 6 (0.50 mmol) was suspended in dry methanol (10 mL) and under an atmosphere of hydrogen a catalytic amount of 10% Pd/C was added. The suspension was stirred at 20 °C until completion (TLC) and filtered over Celite. The filter aid was washed with methanol (5 mL). The solvent was removed in vacuo and the crude product was washed with diethyl ether (1 × 5 mL) to obtain pure 8.
-
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-
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43
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1542699061
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note
-
3), 23.40 (C-4′), 29.86 (C-3′), 32.42 (C-2′), 34.94 (C-1′), 108.78 (C-3), 119.05 (C-8), 124.97 (C-6), 125.45 (C-4a), 125.92 (C-5), 133.30 (C-7), 141.54 (C-8a), 157.02 (C-2), 180.53 (C-4).
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