Regio-controlled Prenylation and Geranylation of 3-Furylmethylmagnesium Bromide. Selective Syntheses of 3-Substituted Furanoid and 2-Substituted 3-Methylfuranoid Terpenes
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1246/bcsj.56.1446
日期:1983.5
main products. When the reactions were carried out in the presence of a catalytic amount of copper(I) iodide, normal coupling occurred and 3-substituted furans, perillene and dendrolasin, were formed in good yields. The related naturally occurring 3-substitutedthiophene, 3-(4-methyl-3-pentenyl)thiophene, was also synthesized from 3-thienylmethylmagnesium bromide and prenyl diethy phosphate.
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。
Syntheses of perillene and natural congeners via Li2CuCl4-catalyzed cross-coupling reaction of allylic carbonates
作者:Ya-Nan Sun、Qi Wang、Ling He、Xi Wang、Wei-Dong Z. Li
DOI:10.1016/j.tetlet.2021.153610
日期:2022.2
Perillene is an essential ingredient in a Chinese patent drug and features some fascinating biological activities. We present herein an efficient pathway to perillene that hangs on the cross-couplingreaction of allylic carbonates with furfuryl Grignard reagent catalyzed by Li2CuCl4. The synthetic applications of this transformation were demonstrated by the synthesis of analogical natural products dendrolasin
紫苏烯是一种中成药的重要成分,具有一些令人着迷的生物活性。我们在此提出了一种有效的紫苏烯途径,该途径取决于由 Li 2 CuCl 4催化的烯丙基碳酸酯与糠基格氏试剂的交叉偶联反应。这种转化的合成应用通过合成类似的天然产物 dendrolasin、ambliofuran 和 thioperillene 得到证明。
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.
their odors differed significantly from those of the corresponding sulfur-free compounds. The introduction of a sulfur atom does not necessarily result in a sulfur-like odor. In particular, the 2(5H)-thiophenone analogs gave waxy, oily, and lactone-like odors that are uncharacteristic of sulfur-containing compounds. In many synthesized analogs, the introduction of a sulfur atom led to an increase in odor