A Three-Step Method for the Preparation of <i>N</i>-Substituted 3,4-Dihydroisoquinolin-1(2<i>H</i>)-ones and Heteroaryl-Fused 3,4-Dihydropyridin-2(1<i>H</i>)-ones from 2-Bromobenzoate Precursors
作者:Emily E. Freeman、Randy Jackson、Jessica Luo、Rajen Somwaru、Alex A. Sons、Andrew Bean、Ronald N. Buckle、R. Jason Herr
DOI:10.1021/acs.joc.2c02670
日期:2023.2.17
process, these (hetero)arylethylamines undergo base-mediated ring closure followed by N-deprotection and N-alkylation to produce N-substituted 3,4-dihydroisoquinolin-1(2H)-ones and heteroaryl-fused N-benzyl 3,4-dihydropyridin-2(1H)-ones. Mechanistic work was performed to elucidate the order of transformations for the latter two-stage process. The method was also extended to the production of N-benzyl
我们展示了通过整体三步交叉偶联/环化/ N-脱保护/ N-烷基化序列制备多种N-取代的 3,4-二氢异喹啉-1(2 H )-one 化合物的通用方法。在第一步中,2-溴苯甲酸乙酯和 2-溴-1-羧乙基杂环与市售钾(2-((叔丁氧羰基)氨基)乙基)三氟硼酸盐交叉偶联,生成(杂)芳基取代的 3- [( N -Boc-2-羧乙基)苯基]乙胺。在随后的两阶段过程中,这些(杂)芳基乙胺经历碱基介导的环闭合,然后是N -脱保护和N-烷基化生成N-取代的 3,4-二氢异喹啉-1(2 H )-ones 和杂芳基稠合的N-苄基 3,4-二氢吡啶-2(1 H )-ones。进行了机械工作以阐明后两阶段过程的转换顺序。该方法还扩展到生产N-苄基异吲哚啉-1-酮和N-苄基 2,3,4,5-四氢-1 H-苯并[ c ]氮卓-1-酮。