反应详情

Adapting literature known protocols (U.S. Pat. No. 8,344,028; and Kabalka and Varma, Org. Prep. Proced. Int., 1987, 19(4-5), 283-328), 1-methyl-4-nitro-2-[(E)-2-nitrovinyl]benzene (19a) is prepared by heating a solution of commercial 2-methyl-5-nitro-benzaldehyde (5j) (1.65 g, 10.0 mmol) (for a synthesis of (5j) see also Example 5, Method B), ammonium acetate (NH4OAc) (1.31 g, 17.0 mmol) in a mixture of nitromethane (MeNO2) (1.61 mL, 1.83 g, 30.0 mmol) and acetic acid (HOAc) (10.0 mL) to reflux for about 3 hours. Aqueous work-up and purification by silica gel column chromatography using ethyl acetate (EtOAc) and hexanes mixtures afford the title compound (19a).

1. custom, 1987, 19(4-5), 283-328), 1-methyl-4-nitro-2-[(E)-2-nitrovinyl]benzene (19a) is prepared
2. temperatureto reflux for about 3 hours
3. customAqueous work-up and purification by silica gel column chromatography