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(2007)
Tetrahedron
, vol.63
, pp. 321
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Argyropoulos, N.G.1
Panagiotidis, T.2
Coutouli-Argyropoulou, E.3
Raptopoulou, C.4
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78
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0027994561
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Dondoni, A.; Franco, S.; Junquera, F.; Merchan, F.; Merino, P.; Tejero, T. Synth. Commun. 1994, 22, 2537.
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(1994)
Synth. Commun
, vol.22
, pp. 2537
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Dondoni, A.1
Franco, S.2
Junquera, F.3
Merchan, F.4
Merino, P.5
Tejero, T.6
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79
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67849134651
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1H NMR spectrum of crude compound obtained from evaporation of toluene, showed additional signals (<7%) corresponding to unreacted dimethyl maleate. However, no other signals corresponding to other diastereomers were detected.
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1H NMR spectrum of crude compound obtained from evaporation of toluene, showed additional signals (<7%) corresponding to unreacted dimethyl maleate. However, no other signals corresponding to other diastereomers were detected.
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80
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67849134650
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All new compounds have been characterised by IR, 1H NMR, 13C NMR, and elemental analysis. Selected Procedure and Analytical Data for Compound 5 A solution of nitrone 414 (2.0 g, 5.5 mmol) and dimethyl maleate (2.3 g, 16.5 mmol) in toluene (20 mL) was stirred under nitrogen atmosphere at r.t. for 5 h. The reaction mixture was concentrated under reduced pressure and purified by column chromatography (n-hexane-EtOAc, 85:15) to afford cycloadduct as a white solid (2.5 g, 89, mp 99-101°C; Rf, 0.7 (hexane-EtOAc, 6:4, α]D25 -83.5 (c 0.3, CHCl3, IR (KBr, 1753, 1728, 1494 cm-1. 1H NMR (300 MHz, CDCl 3, δ, 1.22 (s, 3 H, 1.30 (s, 3 H, 1.35 (s, 3 H, 1.50 (s, 3 H, 3.62 (dd, J, 8.1, 1.5 Hz, 1 H, 3.96 (s, 3 H, 3.99 (s, 3 H, 3.93-4.30 (m, 2 H, 4.17 (d, J, 13.5 Hz, 1 H, 4.27 dd, J, 4.8, 1.8 Hz, 1 H
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7: C, 45.29; H, 7.22. Found: C, 49.31; H, 7.30.
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