The reactions of 3-fluoro-4-R-6-phenylsulfonylmethylnitrobenzenes with dimethyl fumarate or diethyl maleate in acetonitrile in the presence of an excess of K2CO3 and a catalytic amount of 18-crown-6 afforded mixtures of dialkyl 6-R-7-fluoro- and dialkyl 6-R-7-phenylsulfonylquinoline-2,3-carboxylate N-oxides, as well as dialkyl 6-R-7-fiuoro- quinoline-2,3-carboxylates (alkyl is methyl or ethyl), which were resolved by column chromatography and identified by 1H NMR spectroscopy and X-ray diffraction.
3-
氟-4-R-6-苯磺酰基
甲基硝基苯与
富马酸二甲酯或
马来酸二乙酯在
乙腈中在过量 K2CO3 和催化量的
18-冠-6 存在下反应,得到二烷基 6-R-7- 的混合物
氟-和二烷基6-R-7-苯磺酰基
喹啉-2,3-
甲酸酯N-氧化物,以及二烷基6-R-7-
氟-
喹啉-2,3-
甲酸酯(烷基为甲基或乙基),其为通过柱色谱法进行解析,并通过 1H NMR 光谱和 X 射线衍射进行鉴定。