1826-14-8Relevant articles and documents
Efficient conversion of ketones to α-tosyloxyketones with m-chloroperbenzoic acid and p-toluenesulfonic acid in the presence of catalytic amount of IL-supported PhI in [emim]OTs
Akiike, Junnosuke,Yamamoto, Yukiharu,Togo, Hideo
, p. 2168 - 2172 (2007)
Various ketones were smoothly converted into the corresponding α-tosyloxyketones with MCPBA and p-toluenesulfonic acid in the presence of a catalytic amount of ionic-liquid (IL)-supported PhI in room temperature ionic liquid, [emim]OTs. Moreover, the pres
Environmentally benign preparation of heteroaromatics from ketones or alcohols, with macroporous polystyrenesulfonic acid and (diacetoxyiodo)benzene, followed by thioamide, amidine, and 2-aminopyridine
Ueno, Makoto,Togo, Hideo
, p. 2673 - 2677 (2004)
An operationally simple, efficient, and environmentally benign preparation of heteroaromatics such as thiazoles, imidazoles, and imidazo[1,2-a]pyridines from the reactions of a polymer-supported [hydroxy(sulfonyloxy)iodo]benzene (2) with ketones or alcohols, followed by treatment with thioamides, benzamidine, and 2-aminopyridine, respectively, in the presence of potassium carbonate were successfully carried out.
Preparation method of 2, 4-disubstituted thiazole compound
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Paragraph 0030-0032; 0034; 0041-0044, (2020/11/23)
The invention discloses a preparation method of a 2, 4-disubstituted thiazole compound. The method comprises the following steps: carrying out heating reflux reaction on substituted carboxylic acid inthionyl chloride to obtain yellow transparent liquid, and adding dichloromethane to dilute for later use; in an ice bath, slowly dropwise adding the substituted acyl chloride solution into ammonia water while stirring, stirring at room temperature to separate out a white solid, and after the reaction is finished, carrying out suction filtration, washing and drying to obtain substituted amide; carrying out reflux on substituted amide and Lawesson in tetrahydrofuran, carrying out rotary evaporation to remove the solvent after the reaction is finished, and carrying out column purification on thecrude product to obtain substituted sulfamide. The preparation method comprises the following steps: putting substituted sulfamide, ethanol, triethylamine and an alpha-bromocarbonyl compound into a pressure reaction tank, putting the pressure reaction tank into an annular focusing single-mode microwave synthesizer for irradiation, and cooling with compressed air to obtain a target compound. Basedon microwave synthesis, the invention has the advantages of short reaction time, high yield, high heating speed, environment friendliness and the like, and provides a microwave synthesis method of a2, 4-disubstituted thiazole compound.
Br?nsted acid-promoted thiazole synthesis under metal-free conditions using sulfur powder as the sulfur source
Ni, Penghui,Tan, Jing,Li, Rong,Huang, Huawen,Zhang, Feng,Deng, Guo-Jun
, p. 3931 - 3935 (2020/02/04)
A Br?nsted acid-promoted sulfuration/annulation reaction for the one-pot synthesis of bis-substituted thiazoles from benzylamines, acetophenones, and sulfur powder has been developed. One C-N bond and multi C-S bonds were selectively formed in one pot. The choice of the Br?nsted acid was the key to the high efficiency of this transformation under metal-free conditions.