Citric acid as a trifunctional organocatalyst for thiocyanation of aromatic and heteroaromatic compounds in aqueous media
作者:Ardeshir Khazaei、Mohammad Ali Zolfigol、Mohmmad Mokhlesi、Mahtab Pirveysian
DOI:10.1139/v2012-013
日期:2012.5
A green and simple procedure for the thiocynation of aromatic and heteroaromatic rings in the presence of a cata- lytic amount of citric acid in water are described. The reactions proceed in high yields, with short reaction times and under mild conditions.
Heterogeneous and Catalytic Thiocyanation of Aromatic Compounds in Aqueous Media
作者:Mohammad Ali Zolfigol、Ardeshir Khazaei、Mohammad Mokhlesi、Hoshang Vahedi、Sami Sajadifar、Mahtab Pirveysian
DOI:10.1080/10426507.2011.610846
日期:2012.3.1
Abstract This article describes a highlyefficient heterogeneous catalyticthiocyanation of indoles, substituted anilines (electron rich and electron deficient) and N-substituted aromatic amines in water under mild and green conditions. The reaction of substrates with KSCN in the presence of silica sulfuric acid (SSA) and silica boron sulfonic acid (SBSA) as heterogeneous catalysts and H2O2 or UHP
Silica-bonded vanadic acid [SiO2–VO(OH)2] as a heterogeneous and recyclable catalyst for thiocyanation of organic compounds in aqueous media at room temperature
作者:Ardeshir Khazaei、Mohammad Ali Zolfigol、Maliheh Safaiee、Mohammad Mokhlesi、Elmira Donyadari、Morteza Shiri、Hendrik Gerhardus Kruger
DOI:10.1016/j.catcom.2012.04.015
日期:2012.9
Silica vanadic acid (in which vanadiumoxytrichloride has been supported on silica) is applied as an efficient, reusable and heterogeneous catalyst for the thiocyanation of heterocycles, substituted anilines (electron-rich and electron-deficient) and N-substituted aromatic amines using hydrogen peroxide in the water as a solvent at room temperature. The catalyst can be easily recovered and reused for
Simple and Highly Efficient Catalytic Thiocyanation of Aromatic Compounds in Aqueous Media
作者:Ardeshir Khazaei、Mohammad Ali Zolfigol、Mohmmad Mokhlesi、Fateme Derakhshan Panah、Sami Sajjadifar
DOI:10.1002/hlca.201100244
日期:2012.1
Two simple, mild, and efficient procedures for the thiocyanation of N‐heterocycles, substituted anilines (electron‐rich and electron‐deficient), and N‐substituted aromatic amines at room temperature are reported (Table 3). The first uses H2O2 as pollution‐free oxidant and the second H5IO6; both with the reagent potassium thiocyanate in H2O as solvent. These procedures provided the target thiocyanates
据报道,在室温下,有两种简单,温和且有效的程序用于N杂环,取代的苯胺(富电子和缺电子的苯胺)和N取代的芳族胺的硫氰化(表3)。第一种使用H 2 O 2作为无公害氧化剂,第二种使用H 5 IO 6。两者均以试剂硫氰酸钾在H 2 O中的溶剂为溶剂。这些步骤在短的反应时间之后以良好至优异的产率和高的区域选择性提供了目标硫氰酸盐。
An efficient synthesis of 4-Thiocyanato anilines using benzyltrimethylammonium dichloroiodate and ammonium thiocyanate in DMSO:H2O
作者:Reuben Dass、Justin D. Singleton、Matt A. Peterson
DOI:10.1016/j.tetlet.2022.153809
日期:2022.5
substitution. 3-Substituted, 3,5- or 2,6-disubstituted anilines and substituted phenols were also well tolerated. 4-Substituted anilines gave the corresponding 2-aminobenzothiazole products, whereas 4-, 5-, 6-, or 7-substituted indoles were not reactive. Regioselective thiocyanation of 2-quinoline, 3-amino-1-methylpyrazole, 2-amino-4-phenylthiazole, and 2-phenylimidazo[1,2-a] pyridine was achieved in
在 70 °C 下,在 DMSO:H 2 O (9:1)中用苄基三甲基二氯碘酸铵(1.2 equiv)和硫氰酸铵(1.2 equiv)处理各种 2(3)-单取代苯胺,得到相应的 4-硫氰酸根- 2(3)-取代的苯胺具有出色的分离产率(60–99%;所有苯胺的平均产率 = 90%)。该反应适用于具有 2-卤代、2-烷氧基、2-芳氧基、2-烷基、2-二烷基氨基、2- N-磺酰基氨基、2-炔基-1-基、2-氰基、2-酰基、2-磺酰基和2-杂芳基取代。3-取代、3,5-或2,6-二取代苯胺和取代苯酚也具有良好的耐受性。4-取代的苯胺产生相应的2-氨基苯并噻唑产物,而4-、5-、6-或7-取代的吲哚不反应。2-喹啉、3-氨基-1-甲基吡唑、2-氨基-4-苯基噻唑和2-苯基咪唑并[1,2-a]吡啶的区域选择性硫氰化产率为93-99%,从而证明了广泛的底物这种硫氰化反应的范围。