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47
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28844433130
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note
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See Supporting Information for detailed protocols and NMR monitoring of each reaction.
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48
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28844456624
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note
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Reaction of isolated 3b with EtMgBr in our standard conditions (see Table 2) gave dihydropyridine 8b in 91% yield.
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49
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28844432093
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note
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2O to provide single crystals suitable for X-ray analysis.
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50
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0032831523
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and references therein
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For examples of related N-acylpyridinium salt isolation, see: (a) Wagner, R.; Wiebel, B.; Günther, W.; Görls, H.; Anders, E. Eur. J. Org. Chem. 1999, 2383-2390 and references therein.
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Wagner, R.1
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51
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(b) Singh, P.; Comins, D. L.; Joseph, S. P. Acta Crystallogr. 1994, C50, 25-27.
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Singh, P.1
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0035965734
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Charette, A. B.; Grenon, M.; Lemire, A.; Pourashraf, M.; Martel, J. J. Am. Chem. Soc. 2001, 123, 11829-11830.
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Charette, A.B.1
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Lemire, A.1
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15444361998
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Lemire, A.; Beaudoin, D.; Grenon, M.; Charette, A. B. J. Org. Chem. 2005, 70, 2368-2371.
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Lemire, A.1
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58
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28844485146
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note
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13C NMR.
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59
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28844464467
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note
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19F NMR.
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