Sequential Intermediates in the Base-Catalyzed Conversion of Bis(π-conjugated propargyl) Sulfones to 1,3-Dihydrobenzo- and Naphtho[<i>c</i>]thiophene-2,2-dioxides
作者:Yossi Zafrani、Hugo E. Gottlieb、Milon Sprecher、Samuel Braverman
DOI:10.1021/jo051692i
日期:2005.11.1
In a recent article, we reported on the base-catalyzed rearrangements of dipropargyl selenides, -sulfides, -sulfoxides, and -sulfones that eventually lead to polycyclic aromatic products. In the present work, we report on the first isolation and characterization of the thiophene dioxide intermediates 5b,c from a mild tandem isomerization/cyclization/aromatization of bis(π-conjugated propargyl) sulfones
在最近的一篇文章中,我们报道了最终导致多环芳族产物的双炔丙基硒化物,-硫化物,-亚砜和-砜的碱催化重排。在本工作中,我们报道了从双(π-共轭炔丙基)砜的轻度串联异构化/环化/芳构化反应中,首先分离并表征了噻吩二氧化物中间体5b,c。还通过NMR鉴定了单烯丙基2b,c和二烯丙基3b中间体。对1a - c重排的动力学研究表明,异常的串联反应过程高度依赖于γ取代的性质。