620103-22-2Relevant articles and documents
Method for performing driving synthesis of 4-alkyl or aryl-2-aminothiazole by visible light
-
Paragraph 0165; 0166; 0167; 0168; 0169; 0170, (2018/04/02)
The invention relates to a method for performing driving synthesis of 4-alkyl or aryl-2-aminothiazole by visible light. The method comprises the following steps: adding an olefin azide compound, ammonium thiocyanate and copper acetate into a solvent acetonitrile separately, performing driving reaction by using visible light with wavelength of 450 to 460 nm at the temperature of 25 DEG C for 20 to36 hours to obtain reaction liquid, and spin-drying the reaction liquid to obtain concentrate; and performing silica-gel column chromatography on the concentrate to obtain the 4-alkyl or aryl-2-aminothiazole. The method is high in yield, mild in condition and low in environmental pollution.
Visible-Light-Driven Synthesis of 4-Alkyl/Aryl-2-Aminothiazoles Promoted by in Situ Generated Copper Photocatalyst
Lei, Wen-Long,Wang, Tao,Feng, Kai-Wen,Wu, Li-Zhu,Liu, Qiang
, p. 7941 - 7945 (2017/11/10)
Room-temperature synthesis of 4-alkyl/aryl-2-aminothiazoles from vinyl azides and ammonium thiocyanate was accomplished with the aid of copper salts and blue LED irradiation. Mechanism investigation indicates that in situ-formed Cu(NCS)2- plays dual important roles in the reaction: (1) as the photocatalyst to activate vinyl azides, (2) as the Lewis acid catalyst to promote ring opening of 2H-azirines with thiocyanide. This process is distinguished by high yields, mild conditions, low catalyst loadings, and tolerating numerous alkyl- and aryl vinyl azides with an array of functional groups.