Three-Step Synthesis of Ethyl Canthinone-3-carboxylates from Ethyl 4-Bromo-6-methoxy-1,5-naphthyridine-3-carboxylate via a Pd-Catalyzed Suzuki–Miyaura Coupling and a Cu-Catalyzed Amidation Reaction
作者:Heraklidia A. Ioannidou、Aaron Martin、Andreas Gollner、Panayiotis A. Koutentis
DOI:10.1021/jo200824b
日期:2011.6.17
analogues 1c–k were prepared from readily prepared ethyl 4-bromo-6-methoxy-1,5-naphthyridine-3-carboxylate (2b) via a three-step non-classical approach that focused on construction of the central pyrrole (ring B) using Pd-catalyzed Suzuki–Miyaura coupling followed by Cu-catalyzed C–N coupling. Furthermore, treatment of the ethyl canthinone-1-carboxylate 1b with NaOH in DCM/MeOH (9:1) gave the canthin-6-one-1-carboxylic
通过三步法,由易于制备的4-溴-6-甲氧基-1,5-萘啶-3-羧酸乙酯(2b)制备了canthin-6--1--1-羧酸乙酯(1b)和9个类似物1c - k。非经典方法集中于使用Pd催化的Suzuki-Miyaura偶联和Cu催化的C-N偶联来构建中心吡咯(B环)。此外,用NaOH在DCM / MeOH(9:1)中处理芸苔酮-1-羧酸乙酯1b以高收率得到了芸苔酮-6--1--1-羧酸(6)。所有化合物均已充分表征。