98827-44-2. A heterogeneous catalyst is a catalyst that is present in a different phase than the reactants. Such catalysts generally function by furnishing an active surface upon which a reaction can occur. 98827-44-2, name is :Methyl 4-hydroxy-2H-thieno[2,3-e][1,2]thiazine-3-carboxylate 1,1-dioxide, introduce a new downstream synthesis route as follows.
5.3 g of TNXK-3 and 20 ml of methanol were added to a reaction flask. Stir at room temperature. Separately add dimethyl sulfate 3.7 g methanol (5 ml) solution and 50% sodium hydroxide solution (5 ml). After the completion of the dropping, room temperature reaction 3 hours, cooling to 10 degrees, the water 50 ml dilution, use 10% hydrochloric acid to the PH is 3. Filtering, the filter cake after the water washing, drying, recrystallization with methanol, 60 degrees decompression drying, getting white solid 4.8 g, yield 86%.
At the same time, in my other blogs, there are other synthetic methods of this type of compound, Methyl 4-hydroxy-2H-thieno[2,3-e][1,2]thiazine-3-carboxylate 1,1-dioxide, and friends who are interested can also refer to it.
Reference£º
Patent; Jiangxi Yong Tong Technology Co., Ltd.; Liu Zhongchun; (13 pag.)CN107141308; (2017); A;,
Thiazine – an overview | ScienceDirect Topics
Thiazine | C4H5NS – PubChem