Reaction of the diethyl 2-nitro-4-(trifluoromethyl)benzylidenemalonate with diethylamine in alcohols resulted in the reduction of the nitro group and the oxidation of the vinylic carbon attached to the phenyl ring. Simultaneous migration of the malonic fragment gave the appropriate 2-amino-4-(trifluoromethyl)benzoate esters. The presence of at least two nitro groups, or one nitro group and trifluoromethyl group on the phenyl ring, attached to the α-carbon and strongly electron withdrawing substituents at the β-carbon (CO2Et, CN) in ortho-nitrobenzylidene systems is necessary for this reductiveoxidative rearrangement to proceed. Reaction of nitrocinnamates with thiols in the presence of triethylamine in tetrahydrofuran gave Michael addition products with different regioselectivity of addition. Ethyl 2-nitrocinnamate undergoes standard β-addition of thiols to a carboncarbon double bond. However, 2,4-dinitro- and 2,4,6-trinitrocinnamates undergo α-addition of thiols, indicating that the presence of two nitro groups on the phenyl ring can reverse polarity of the carboncarbon double bond in cinnamate acceptors.Key words: abnormal Michael reactions, aromatic nitro compounds, benzylidene compounds, rearrangements.
二乙基2-硝基-4-(三
氟甲基)苯基
丙烯基
丙二酸二乙酯在醇中与
二乙胺反应,导致硝基团的还原和连接到苯环上的烯基碳的氧化。马隆酸残基的同时迁移产生适当的2-
氨基-4-(三
氟甲基)
苯甲酸酯。对于这种还原-氧化重排反应,苯环上至少存在两个硝基,或一个硝基和三
氟甲基团,连接到α-碳,并且在β-碳(CO₂Et,CN)上具有强电子吸引取代基在邻
硝基苯基
丙烯酮系统中是必要的。硝基
肉桂酸酯在
四氢呋喃中与
硫醇在
三乙胺存在下反应,产生具有不同加成区域选择性的迈克尔加成产物。乙基
2-硝基肉桂酸酯经历了
硫醇对碳-碳双键的标准β-加成。然而,2,4-二硝基和2,4,6-三硝基
肉桂酸酯经历了
硫醇的α-加成,表明苯环上存在两个硝基可以颠倒
肉桂酸受体中碳-碳双键的极性。关键词:异常迈克尔反应,芳香
硝基化合物,苄亚甲基化合物,重排。