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See ref. 10b
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(a) See ref. 10b.
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38
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34248232378
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General Procedure for MCRs: To a solution of ketoester or ketoamide 1 (1 mmol) and DBU (3 mmol) in appropriate solvent (4 mL, Table 1) was added the corresponding aldehyde 2 (1.1 mmol) and halide 3 (2 mmol, The resulting solution was stirred for the indicated time and at the indicated temperature (Table 1, After completion of the reaction and evaporation of most of the solvent under reduced pressure, 1 N solution of HCL (30 mL) was added to the oily residue. Extraction with Et2O (3 x 40 mL) followed by successive washing with distilled H2O (2 x 20 mL) and brine (20 mL) gave, after drying (MgSO4) and evaporation of the solvent, the crude compounds which were purified by flash chromatography on silica gel. Physical Data for Compound 4b: yellow oil; R f[Et2O-PE (50:50, 0.79. IR (liquid film, 2942, 1740, 1678, 1588, 1472, 1208, 1133, 927 cm-1. MS: m/z, 305 100, M
-
3): δ = 197.3, 168.9, 151.6, 144.7, 131.3, 132.0, 128.2, 118.8, 115.9, 120.1, 112.9, 115.5, 66.6, 60.4, 38.6, 32.7.
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40
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0033612270
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(b) Cossy, J.; Bauer, D.; Bellosta, V. Tetrahedron Lett. 1999, 40, 4187.
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Cossy, J.1
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41
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0032566021
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(c) Ghosh, A. K.; Cappiello, J.; Shin, D. Tetrahedron Lett. 1998, 39, 4651.
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Ghosh, A.K.1
Cappiello, J.2
Shin, D.3
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43
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34248164881
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General Procedure for RCMs: To a 6 × 10-3 M solution of spiroheterocyclic precursors 4a-e in anhyd CH 2Cl2, under an atmosphere of argon, Grubbs' catalyst 5b was introduced in several portions of 2% every 2 h. The mixture was stirred at reflux and completion of reaction was checked by TLC. The mixture was filtered through a pad of silica gel and celite and the crude material was purified by flash chromatography on silica gel. Physical Data for Compound 6c: yellow solid; mp 104-106°C. IR (liquid film, 2960, 1708, 1620, 1460, 1201, 1030 cm-1. MS: m/z, 290 (100, M, H, 233 (17, 190 (5, 1H NMR (300.13 MHz, CDCl 3, β, 7.53 (d, J, 1.7 Hz, 1 H, 7.32 (s, 1 H, 6.67 (d, J, 3.3 Hz, 1 H, 6.49 (dd, J, 1.7, 3.3 Hz, 1 H, 5.75-5.85 (m, 2 H, 3.90-4.18 (m, 2 H, 3.81 (d, J, 11.7 Hz, 1 H, 3.03 (s, 3 H, 3.00 d, J, 11.7
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3): δ = 198.6, 170.2, 151.8, 144.4, 127.7, 125.8, 128.4, 112.8, 115.5, 115.0, 60.4, 49.8, 38.9, 35.1, 31.9.
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44
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0000633011
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Vinyl Substitution with Organopalladium Intermediates
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Pergamon: Oxford
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Heck, R. F. Vinyl Substitution with Organopalladium Intermediates, In Comprehensive Organic Synthesis, Vol. 4; Pergamon: Oxford, 1991.
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(1991)
Comprehensive Organic Synthesis
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Heck, R.F.1
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45
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0029743317
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(a) Wolfe, J. P.; Wagaw, S.; Buchwald, S. L. J. Am. Chem. Soc. 1996, 118, 7215.
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J. Am. Chem. Soc
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Wolfe, J.P.1
Wagaw, S.2
Buchwald, S.L.3
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47
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34248136833
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General Procedure for Heck Reaction: To a 4 × 10 -2 M solution of spiroheterocyclic precursors 4f and 4g in anhyd MeCN, under an atmosphere of argon, palladium acetate (4 equiv) and PPh3 (8 equiv) were added, followed by Et3N (1.2 equiv, The mixture was stirred at reflux and the completion of reaction was checked by TLC. The mixture was filtered through a pad of celite and the crude material was purified by flash chromatography on silica gel. Physical Data for Compound 7b: yellow powder; mp 169-171°C. IR (liquid film, 2926, 1719, 1626, 1444, 1337, 1256, 940 cm-1. MS: m/z, 326 (100, M, H, 295 (3, 255 (3, 201 (3, 164(16, 1H NMR (300.13 MHz, CDCl3, δ, 7.34-7.64 (m, 6 H, 5.41 (d, J, 0.9, 16.6 Hz, 2 H, 5.02 (d, J, 9.3 Hz, 1 H, 4.72 (dd, J, 1.1, 15.1 Hz, 2 H, 4.04 (dd, J =0.9, 11.3 Hz, 1 H, 3.57 d, J, 15
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3): δ = 200.9, 169.0, 143.5, 141.8, 135.0, 130.5, 129.6, 129.5, 129.2, 128.8, 115.3, 112.8, 61.4, 54.2, 39.4, 37.1, 31.1.
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