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General Procedure for Michael Addition of Glycine Imines to Aromatic Nitroalkenes To a stirred solution of nitroalkene (1.2 mmol, LiOTf (16 mg, 0.1 mmol, and ethyl diphenylmethyleneiminoacetate (267 mg, 1 mmol) or tert-butyl diphenylmethyleneiminoacetate (295 mg, 1 mmol) in dry THF (1 mL) was added DBU (15 mg, 0.1 mmol) in dry THF (1 mL, The mixture was stirred at r.t. for 24 h. After being quenched by H2O, the mixture was extracted by CH2Cl2. The organic phase was separated and dried with Na2SO4. The diastereoselectivity was determined by NMR analysis of curde product. The sample for analysis was purified on column chromatography (SiO2, 200-300 mesh) using PE-EtOAc (20:1) as eluent and recrystallized from Et2O and PE. syn-Ethyl 2-Diphenylmethyleneimino-4-nitro-3-phenylbutanoate (5a) According to the general procedure, a white solid was obtained; mp 84-85 °C. 1H NMR 300
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4: C, 72.54; H, 6.09; N, 6.51. Found: C, 72.36; H, 6.22; N, 6.35.
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