Unexpected Substituent Effects in Spiro-Compound Formation: Steering <i>N</i>-Aryl Propynamides and DMSO toward Site-Specific Sulfination in Quinolin-2-ones or Spiro[4,5]trienones
作者:Xiaoxian Li、Yuanxun Wang、Yaxin Ouyang、Zhenyang Yu、Beibei Zhang、Jingran Zhang、Haofeng Shi、Han Zuilhof、Yunfei Du
DOI:10.1021/acs.joc.1c00775
日期:2021.7.16
pathways leading to the formation of quinolin-2-ones for mild substituents and spiro[4,5]trienones for both electron-withdrawing and -donating substituents, respectively. On the basis of both computational and experimental results, a new mechanism has been put forward that accounts for the exclusive spirolization/defluorination process and the surprising substituent effects.
高度依赖于取代基的重排允许通过N-芳基丙酰胺的分子内亲电环化新的和 SOCl 2诱导的 3-methylthioquinolin-2-ones 和 3-methylthiospiro[4.5] trienones 的不同合成。DMSO 既充当溶剂又充当硫源,并且使用 DMSO- h 6 / d 6能够将 SCH 3或 SCD 3部分结合到杂环骨架的 3 位。不同段- 取代基触发不同的反应途径,分别导致温和取代基的喹啉-2-酮和吸电子和供电子取代基的螺[4,5] 三烯酮的形成。在计算和实验结果的基础上,提出了一种新的机制,可以解释独特的螺旋化/脱氟过程和令人惊讶的取代基效应。