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Quite recently, highly exo and enantioselective nitrone 1,3-DC using bidentate chiral BOX-Cu(II) complexes has been reported, in which 1,5,5-tri-substituted 2-alkenoylpyrazolidin-3-one dipolarophiles were employed. M.P. Sibi, Z. Ma, and C.P. Jasperse J. Am. Chem. Soc. 126 2004 718
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9644265067
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note
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4M 352.1423. HPLC (Chiralpak AD, i-PrOH/hexane 1:9, 1.0 mL/min, 25°C) t = 11.6 min for (3S,4S,5R)-exo, t = 12.1 min for (3R,4R,5S)-exo, t = 20.7 min for (3S,4R,5S)-endo, t = 32.1 min for (3R,4S,5R)-endo isomer
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