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During our investigation, Jacobsen et al. reported asymmetric catalytic addition to imines with HCN or ketene silyl acetals. Very recently, Schreiner et al. also revealed urea catalyzed 1,3-dipolar cycloaddition with nitrone but the effect was small. See: (a) Vachal, P.; Jacobsen, E. N. J. Am. Chem. Soc. 2002, 124, 10012-10014; (b) Wenzel, A. G,; Jacobsen, E. N. J. Am. Chem. Soc. 2002, 124, 12964-12965; (c) Wittkopp, A.; Schreiner, P. R. Chem. Eur. J. 2003, 9, 407-414.
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During our investigation, Jacobsen et al. reported asymmetric catalytic addition to imines with HCN or ketene silyl acetals. Very recently, Schreiner et al. also revealed urea catalyzed 1,3-dipolar cycloaddition with nitrone but the effect was small. See: (a) Vachal, P.; Jacobsen, E. N. J. Am. Chem. Soc. 2002, 124, 10012-10014; (b) Wenzel, A. G,; Jacobsen, E. N. J. Am. Chem. Soc. 2002, 124, 12964-12965; (c) Wittkopp, A.; Schreiner, P. R. Chem. Eur. J. 2003, 9, 407-414.
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45
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85031194173
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note
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2: C, 71.87; H, 6.96; N, 6.45. Found: C, 72.06; H, 7.11; N, 6.39%.
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