Sulfur Monoxide Transfer from<i>peri</i>-Substituted Trisulfide-2-oxides to Dienes: Substituent Effects, Mechanistic Studies and Application in Thiophene Synthesis
作者:Richard S. Grainger、Bhaven Patel、Benson M. Kariuki、Louise Male、Neil Spencer
DOI:10.1021/ja108865w
日期:2011.4.20
followed by in situ trapping by diene. Transfer of SO also occurs upon irradiation at room temperature, but yields of sulfoxide are lower. Dehydration of the sulfoxides under Pummerer conditions gives thiophenes, including the naturally occurring thioperillene. Two dienes form thiophenes directly under the SO transfer conditions. The methodology is applied in a formal synthesis of the antiplatelet medication
通过用亚硫酰氯和吡啶处理 1,8-萘二硫醇制备了三个环取代的三硫化物-2-氧化物。1,2,3-trithiane-2-氧化物环在固态下采用沙发构象,具有假轴氧和环应变的证据(周边相互作用)。在二烯存在下加热三硫化物-2-氧化物会导致正式的一氧化硫 (SO) 转移形成不饱和环状亚砜,以及可回收的 1,8-萘二硫化物。萘环上邻甲氧基或邻叔丁基取代基的存在降低了温度并增加了 SO 转移发生的速率。捕获实验和动力学研究与三线态 SO 的产生一致,然后是二烯的原位捕获。SO 的转移也发生在室温下辐照时,但亚砜的收率较低。在Pummerer 条件下,亚砜脱水得到噻吩,包括天然存在的硫紫杉烯。两种二烯在 SO 转移条件下直接形成噻吩。该方法应用于抗血小板药物波立维的正式合成。
A Novel Recyclable Sulfur Monoxide Transfer Reagent
作者:Richard S. Grainger、Alberto Procopio、Jonathan W. Steed
DOI:10.1021/ol016678g
日期:2001.11.1
subsequent trapping with thionyl chloride. Heating trisulfide oxide 11 in the presence of dienes results in transfer of sulfur monoxide to form cyclic unsaturated sulfoxides 13 in good to excellent yields, along with recovery of disulfide 9. A Pummerer reaction can be used to convert the cyclic sulfoxides into thiophenes.
Effective Precursors for Sulfur Monoxide Formation
作者:Imad A. Abu-Yousef、David N. Harpp
DOI:10.1021/jo9709864
日期:1997.11.1
When triphenylmethanesulfenyl chloride (12) (or its thio 13 or dithio homolog 14) are treated with hindered olefins 15 and 16, thiiranes 10 and 11, are produced in high isolated yields (ca. 94%). Treatment of 10 and 11 with m-chloroperoxybenzoic acid (m-CPBA) leads to the formation of thiirane 1-oxides 8 and 9 (99% isolated yields). The structures of 8-11 were established by H-1 and C-13 NMR, mass spectrometry as well as by X-ray. Thermal decomposition of either 8 or 9 smoothly delivers sulfur monoxide to various 1,3-dienes giving cyclic sulfoxides in good yield. A variety of conditions were employed to optimize the yield of the trapped adducts.
[1 + 2] Cycloadditions of Sulfur Monoxide (SO) to Alkenes and Alkynes and [1 + 4] Cycloadditions to Dienes (Polyenes). Generation and Reactions of Singlet SO?
generation of SO under mild conditions. Thus, the SO generated underwent [1 + 2] cycloadditions to a series of alkenes and alkynes to produce thiirane oxides and thiirene 1-oxides, respectively, providing new syntheses of the sulfur-containing three-membered heterocycles. The SO also reacted with a variety of cyclic and acyclic dienes to give the corresponding 2,5-dihydrothiophene 1-oxides.
Diels-Alder 加合物由 3,4-二叔丁基噻吩 1-氧化物和乙炔二甲酸二甲酯产生,在室温下自发地挤出一氧化硫 (SO),是一种在温和条件下生成 SO 的新方法。因此,生成的 SO 与一系列烯烃和炔烃进行 [1 + 2] 环加成反应,分别生成硫杂环丁烷氧化物和硫杂环丙烷 1-氧化物,为含硫三元杂环的合成提供了新的思路。SO 还与各种环状和非环状二烯反应生成相应的 2,5-二氢噻吩 1-氧化物。
Synthesis and selected reactions of 3-methyl-2,5-dihydrothiophene 1-oxide