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33744512132
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a) Chattopadhyay, A.; Goswami, D.; Dhotare, B. Tetrahedron Lett., 2006, 47, 4701;
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Chattopadhyay, A.1
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42
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33846692057
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note
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3 (4.9 g, 0.03 mol)] in THF (70 mL) was added Zn dust (2.25 g, 0.035 mol for Co and Cu; 1.95 g, 0.03 mol for Fe) in portions over a period of 15 min. The mixture was stirred at the ambient temperature for the period as shown in Table 1. The reaction mixture was then treated successively with water (50 mL) and EtOAc (100 mL), stirred for 10 min more and then filtered. The filtrate was treated with 2% aqueous HCl to dissolve a little amount of suspended particles. The organic layer was separated. The aqueous layer was extracted with EtOAc. The combined organic layer was washed with water, brine and then dried. Solvent removal and column chromatography of the residue (silica gel, 0-15% EtOAc in petroleum ether) 7a [19], 7b [20] and 7c [21] in pure form and the diastereomeric ratios in all cases were determined based on their isolated yields after column chromatography as shown in Table 1.
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43
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33846684038
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note
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13C NMR: δ 14.06, 22.61, 23.78, 23.99, 25.09, 27.13, 29,21, 31.30, 31.75, 35.01, 36.39, 47.20, 65.63, 74.88, 76.37, 109.84, 116.70, 138.08.
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44
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33846669192
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note
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13C NMR: δ 13.95, 22.53, 23.67, 23.84, 24.89, 26.66, 29,20, 30.33, 31.71, 34.82, 36.02, 47.52, 63.37, 72.50, 76.47, 109.01, 116.67, 138.50.
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-
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45
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33846691653
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note
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13C NMR: δ 14.04, 22.60, 23.78, 23.95, 25.12, 27.07, 29,21, 30.96, 31.75, 34.85, 36.31, 46.39, 65.40, 73.91, 76.40, 109.03, 117.46, 137.92.
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-
-
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49
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33846678808
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note
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4.
-
-
-
-
50
-
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33846655187
-
-
note
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13C NMR: δ 14.04, 22.59, 27.01, 29.27, 31.78, 35.61, 38.18, 40.45, 67.17, 70.08, 115.27, 142.47.
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-
-
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52
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33846694132
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note
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2).
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53
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33846668521
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Jurczac, J.; Stanslaw, P.; Bauer, T. Tetrahedron, 1984, 42, 447.
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(1984)
Tetrahedron
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Jurczac, J.1
Stanslaw, P.2
Bauer, T.3
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