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A scaleable synthesis of methyl 3-amino-5-(4-fluorobenzyl)-2-pyridinecarboxylate

机译:3-氨基-5-(4-氟苄基)-2-吡啶甲酸甲酯的规模化合成

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摘要

A scaleable synthesis of methyl 3-amino-5-(4-fiuorobenzy1)-2-pyridinecarboxylate (1b), starting from 5-bromo-2-methoxypyridine (8) and 4-fluorobenzaidehyde (9), is described. Key steps in the process include lithium-bromine exchange of 8, addition of the resulting lithiate to aldehyde 9, regioselective nitration of pyridone 12, and Pd-catalyzed alkoxycarbonylation of bromopyridine 15b. Overall yield of the five-stage synthesis was 23%; intermediates 10, 12, 13, 15b, and final product 1b center dot HCl were isolated as filterable solids. Compounds 1a,b are important intermediates in the synthesis of 7-benzylnaphthyridinones (e.g., 2) and related HIV-1 integrase inhibitors.
机译:描述了以5-溴-2-甲氧基吡啶(8)和4-氟苯甲酰肼(9)为起始原料的可规模合成的3-氨基-5-(4-氟罗苯甲醛1)-2-吡啶甲酸甲酯(1b)。该过程中的关键步骤包括将溴化锂8交换,将所得的锂酸盐添加到醛9中,吡啶酮12的区域选择性硝化,以及溴化吡啶15b的Pd催化的烷氧羰基化。五阶段合成的总产率为23%;分离中间体10、12、13、15b和终产物1b中心点HCl为可过滤固体。化合物1a,b是合成7-苄基萘啶酮(例如2)和相关的HIV-1整合酶抑制剂的重要中间体。

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