Regioselective Synthesis of 1,8-Naphthyridinone-Annulated Oxygen and Sulfur Heterocycles by Tri-<i>n</i>-butyl Tinhydride–Mediated Aryl Radical Cyclization
作者:K. C. Majumdar、R. Islam
DOI:10.1080/00397910802238759
日期:2008.11.3
2-bromobenzyloxy ethers were prepared in 62–65% yields by the alkylation of 4-hydroxy-1-phenyl-1,8-naphthyridin-2(1H)-one with 2-bromobenzyl bromides in refluxing acetone in the presence of anhydrous potassium carbonate, the sulfides were derived from 4-mercapto-1-phenyl-1,8-naphthyridin-2(1H)-one and 2-bromobenzyl bromides in 82–84% yields by a phase-transfer catalysis (PTC) reaction. The corresponding sulfones
摘要 研究了在温和、中性条件下氢化锡介导的许多醚、硫化物和砜的环化反应。虽然 2-溴苄氧基醚是通过 4-羟基-1-苯基-1,8-萘啶-2(1H)-one 与 2-溴苄基溴在回流丙酮中的烷基化反应以 62-65% 的收率制备的无水碳酸钾,硫化物衍生自 4-mercapto-1-phenyl-1,8-naphthyridin-2(1H)-one 和 2-bromobenzyl bromides,通过相转移催化 (PTC) 反应,产率为 82-84% . 通过在回流的二氯甲烷中用间 CPBA 处理硫化物来制备相应的砜。醚、硫化物和砜用 n Bu3SnH-AIBN 处理,以 70-78% 的产率区域选择性地得到 1,8-萘啶酮环化的氧和硫杂环。