作者:Teruo Umemoto、Ginjiro Tomizawa
DOI:10.1246/bcsj.59.3625
日期:1986.11
The reaction of sulfides possessing α-hydrogen with various N-fluoropyridinium salts was examined. While the fluorinating power increased in the order of N-fluoro-2,4,6-trimethylpyridinium triflate 12, and 3 no longer produced the α-fluoro sulfide. Triflate 1 was more reactive than the corresponding tetrafluoroborate 4. Thus, it was shown that 1 satisfactorily fluorinated various kinds of sulfides under very mild conditions, giving α-fluoro sulfides. A two-step mechanism, oxidative fluorination of sulfur and Pummerer-type rearrangement, was proposed for the fluorination. The corresponding α-fluoro sulfoxide or sulfones were easily prepared from the sulfides by successive fluorination–oxidation procedure.
我们研究了具有α-氢的硫化物与各种N-氟吡啶盐的反应。氟化能力按以下顺序增加:N-氟-2,4,6-三甲基吡啶三氟甲磺酸盐1 < N-氟吡啶三氟甲磺酸盐2 < N-氟-3,5-二氯吡啶三氟甲磺酸盐3,而α-氟硫化物的产率则按以下顺序递减:1 > 2,3不再产生α-氟硫化物。三氟甲磺酸盐1的反应性优于相应的四氟硼酸盐4。因此,研究表明,1在非常温和的条件下能有效氟化各种硫化物,生成α-氟硫化物。我们提出了一种两步机制,即硫的氧化氟化和Pummerer型重排,用于氟化反应。相应的α-氟亚磺酸盐或磺酮可通过连续的氟化-氧化过程轻松从硫化物中制备。