通过自由基缩合反应合成了一系列具有各种官能团的联苯并[ b ] [1,4]噻嗪。在HOAc中,通过容易获得的2,2'-二硫代二苯胺和甲基芳基酮与AIBN作为自由基引发剂的一步反应,以中等至良好的收率(高达85%)获得联苯并[ b ] [1,4]噻嗪。联苯并[ b ] [1,4]噻嗪表现出多种形式的固态堆积。
A condition-controlled strategy for selectively synthesis of 2-acylbenzothiazoles and bibenzo[b][1,4]thiazines from aryl methyl ketones and disulfanediyldianilines was realized using I2/DMSO or I2/MeCN systems, respectively. The desired products were synthesized in only 15 min with moderate to excellent yields (50%-90%) under microwave-assisted, metal-free conditions. The strategy provides a great
分别使用 I 2 /DMSO 或 I 2 /MeCN 系统实现了从芳基甲基酮和二硫烷二基二苯胺选择性合成 2-酰基苯并噻唑和联苯[ b ][1,4]噻嗪的条件控制策略。在微波辅助、无金属条件下,所需产物仅在 15 分钟内合成,产率中等至极好(50%-90%)。该策略为苯并噻唑和双苯并噻嗪杂环化合物的有效合成中的选择性合成应用提供了巨大优势。
Eco-friendly HClO4-SiO2 catalyzed synthesis of mono- and bis-diaryl-2h-1,4 benzothiazines
作者:Mohd. Imran Ansari、Ravi Shankar、Mohd. Kamil Hussain、Ruchir Kant、Prakash R. Maulik、K. Ravi Kumar、K. Hajela
DOI:10.1002/jhet.795
日期:2011.11
Mono‐ and bis‐diaryl‐2H‐1,4‐benzothiazines were obtained in quantitative yields through silica‐supported perchloric acid catalyzed reaction cascade of double condensation and 1,4 addition of diaroylacetylenes with 2‐aminothiophenol at room temperature. The structures were confirmed by spectroscopic analyses and X‐ray crystallographic studies. J. Heterocyclic Chem., (2011)
In the presence of micromolar peroxides or biometals (Fe(III), Cu(II), V(V) salts), and following a strong acid input, the stable 3-phenyl-2H-1, 4-benzothiazine is efficiently converted to a green-blue Delta(2,2')-bi(2H-1,4-benzothiazine) chromophore via dehydrogenative coupling of a 1,4-benzothiazinyl radical. The new system is of potential practical interest for colorimetric peroxide and redox biometal detection.