Chemodivergent Conversion of Ketenimines Bearing Cyclic Dithioacetalic Units into Isoquinoline-1-thiones or Quinolin-4-ones as a Function of the Acetalic Ring Size
作者:Mateo Alajarin、Marta Marin-Luna、Pilar Sanchez-Andrada、Angel Vidal
DOI:10.1021/acs.joc.9b01014
日期:2019.6.21
3-dithiolan-2-yl or 1,3-dithian-2-yl substituents at ortho position of the C-phenyl ring, respectively, transform into isoquinoline-1-thiones and quinolin-4-ones under thermal treatment in toluene solution. The formation of isoquinolinethiones involves a rare degradation of the 1,3-dithiolane ring, whereas, in contrast, the 1,3-dithiane ring remains intact during the reaction course leading to quinolin-4-ones. Computational
Ç -Alkoxycarbonyl- Ç苯基Ñ在C-苯环的邻位分别带有1,3-二硫杂环戊-2-基或1,3-二硫-2-基的-芳基酮亚胺在以下条件下转化为异喹啉-1-硫酮和喹啉-4-酮在甲苯溶液中进行热处理。异喹啉乙硫酮的形成涉及1,3-二硫杂环戊烷环的罕见降解,而相反,在导致喹啉-4-酮的反应过程中,1,3-二硫杂环戊烷环保持完整。计算密度泛函理论结果支持形成异喹啉-1-硫酮的动力学上有利的机理是通过[1,5]-氢化物转移/6π-电环化级联反应进行的,然后是硫杂环戊烷挤出过程。还研究了显示出有趣的电子重组过程的替代性机械路径,但在充满活力的基础上并没有竞争力。