23699-65-2Relevant articles and documents
Continuous Synthesis of Aryl Amines from Phenols Utilizing Integrated Packed-Bed Flow Systems
Ichitsuka, Tomohiro,Kobayashi, Shū,Koumura, Nagatoshi,Sato, Kazuhiko,Takahashi, Ikko
, p. 15891 - 15896 (2020/07/13)
Aryl amines are important pharmaceutical intermediates among other numerous applications. Herein, an environmentally benign route and novel approach to aryl amine synthesis using dehydrative amination of phenols with amines and styrene under continuous-flow conditions was developed. Inexpensive and readily available phenols were efficiently converted into the corresponding aryl amines, with small amounts of easily removable co-products (i.e., H2O and alkanes), in multistep continuous-flow reactors in the presence of heterogeneous Pd catalysts. The high product selectivity and functional-group tolerance of this method allowed aryl amines with diverse functional groups to be selectively obtained in high yields over a continuous operation time of one week.
Synthesis of Di(hetero)arylamines from Nitrosoarenes and Boronic Acids: A General, Mild, and Transition-Metal-Free Coupling
Roscales, Silvia,Csák?, Aurelio G.
, p. 1667 - 1671 (2018/03/23)
The synthesis of di(hetero)arylamines by a transition-metal-free cross-coupling between nitrosoarenes and boronic acids is reported. The procedure is experimentally simple, fast, mild, and scalable and has a wide functional group tolerance, including carbonyls, nitro, halogens, free OH and NH groups. It also permits the synthesis of sterically hindered compounds.
Method for synthesis of 2-acetyl phenothiazine with m-acetyl phenol and aniline as raw materials
-
Paragraph 0031; 0032, (2016/11/14)
The invention discloses to a method for synthesis of 2-acetyl phenothiazine with m-acetyl phenol and aniline as raw materials. The method comprises the steps: carrying out a dehydration reaction of m-acetyl phenol and aniline with trifluoromethanesulfonic acid as a catalyst; and carrying out an annulation reaction on the product obtained in the first step with elemental sulfur under the catalysis of iodine in an acetone solvent. With m-acetyl phenol and aniline as the raw materials, firstly, amino and phenolic hydroxyl are subjected to dehydration reaction, then the product is subjected to annulation reaction with elemental sulfur, and thus 2-acetyl phenothiazine is obtained. Trifluoromethanesulfonic acid as the dehydration reaction catalyst has stronger acidity and has the effect of relatively strongly protonizing m-acetyl phenol to form a molten salt, and the dehydration yield is increased. Through the two steps, the total yield and purity of 2-acetyl phenothiazine are ensured.