Synthesis of 3,4-Dihydroisoquinolin-1-ones from<i>N</i>-Boc-(β-Arylethyl)carbamates via Isocyanate Intermediates
作者:Jinkyung In、Soonho Hwang、Changhun Kim、Jae Hong Seo、Sanghee Kim
DOI:10.1002/ejoc.201201408
日期:2013.2
reaction conditions for the regioselective synthesis of isoquinolin-1-ones and related fused-ring heterocycles from N-Boc-protected (β-arylethyl)carbamates are described. The reactions involved the use of Tf2O and 2-chloropyridine and isocyanates are likely to be key intermediates. The method was extended to substrates bearing less nucleophilic aryl moieties by using Lewis acid additives, such as BF3·Et2O
描述了从 N-Boc 保护的 (β-芳基乙基) 氨基甲酸酯区域选择性合成异喹啉-1-酮和相关稠环杂环的温和反应条件。涉及使用 Tf2O 和 2-氯吡啶和异氰酸酯的反应可能是关键中间体。通过使用路易斯酸添加剂,如 BF3·Et2O,该方法扩展到带有较少亲核芳基部分的底物,以增强异氰酸酯中间体的 Friedel-Crafts 型环化。该方法允许以良好的产率和高区域选择性合成各种取代的异喹啉-1-酮、β-咔啉、噻吩稠环系统和四氢苯并氮杂-1-酮。