Successive Cycloadditions between 4-Fluoro-5-trifluoromethyl-1,2-dithiole-3-thione and Dimethyl Acetylenedicarboxylate: New Fluorinated Thiaheterocycles through New Reaction Mechanisms
作者:Vadim M. Timoshenko、Jean-Philippe Bouillon、Alexander N. Chernega、Yuriy G. Shermolovich、Charles Portella
DOI:10.1002/ejoc.200300036
日期:2003.7
The cycloaddition reaction between dimethyl 2-(1-fluoro-2-trifluoromethyl-2-thioxoethylidene)-1,3-dithiole-4,5-dicarboxylate and dimethyl acetylenedicarboxylate proceeds efficiently under irradiation conditions in air. A study of the reaction conditions resulted in the proposal of a chain mechanism initiated by a photochemically induced single-electron transfer to oxygen. On the other hand, the cycloadduct
2-(1-氟-2-三氟甲基-2-硫代亚乙基)-1,3-二硫醇-4,5-二甲酸二甲酯和乙炔二甲酸二甲酯之间的环加成反应在空气中的辐照条件下有效进行。对反应条件的研究提出了由光化学诱导的单电子转移到氧引发的链式机制。另一方面,环加合物可以通过硅胶过滤转化为重排的羟基化产物。环加合物或其重排产物可以在一锅法中从母体 1,2-二硫醇-3-硫酮中选择性地获得。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)