申请人:Sterling Drug Inc.
公开号:US03970662A1
公开(公告)日:1976-07-20
4-(3-Nitrophenyl)pyridine, an intermediate useful in the preparation of 1-(lower-alkyl)-1,4-dihydro-4-oxo-7-(4-pyridyl)-3-quinolinecarboxylates, which are useful as anti-bacterial agents, is prepared by reacting 3-nitrobenzaldehyde with two molar equivalents of di-lower-alkyl) oxalacetate (II) in the presence of a catalytic condensing agent, preferably piperidine and/or its acetate, to produce tetra-(lower-alkyl) 3-(3-nitrophenyl)-1,5-pentanedione-1,2,4,5-tetracarboxylate (III), reacting III with ammonia to produce tetra-(lower-alkyl) 1,4-dihydro-4-(3-nitrophenyl)-2,3,5,6-pyridinetetracarboxylate (IV), oxidizing IV to produce tetra-(lower-alkyl) 4-(3-nitrophenyl)-2,3,5,6-pyridinetetracarboxylate (V), hydrolyzing V to produce 4-(3-nitrophenyl)-2,3,5,6-pyridinetetracarboxylic acid (VI) and decarboxylating VI to produce 4-(3-nitrophenyl)pyridine (VII). Intermediates III, IV, V and VI are novel.
4-(3-硝基苯基)吡啶,是制备1-(较低烷基)-1,4-二氢-4-氧代-7-(4-吡啶基)-3-喹啉羧酸酯的中间体,在抗菌剂中有用,通过将3-硝基苯甲醛与二个摩尔当量的二(较低烷基)草酸乙酯(II)在存在催化缩合剂的情况下反应制备,最好是哌啶和/或其醋酸盐,以产生四(较低烷基) 3-(3-硝基苯基)-1,5-戊二酮-1,2,4,5-四羧酸酯(III),将III与氨反应以产生四(较低烷基) 1,4-二氢-4-(3-硝基苯基)-2,3,5,6-吡啶四羧酸酯(IV),将IV氧化以产生四(较低烷基) 4-(3-硝基苯基)-2,3,5,6-吡啶四羧酸酯(V),将V水解以产生4-(3-硝基苯基)-2,3,5,6-吡啶四羧酸(VI),并将VI脱羧以产生4-(3-硝基苯基)吡啶(VII)。中间体III、IV、V和VI是新颖的。