- An efficient and facile process for synthesis of 4,5-dichlorothiophene-2-carboxylic acid using N-chlorosuccinimide
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4,5-Dichlorothiophene-2-carboxylic acid was obtained from the starting material thiophene-2-carboxylic acid via esterification, chlorination and hydrolysis. The chlorination reaction was achieved using N.chlorosuccinimide as the chlorinating agent with high selectivity and yield. The advantages of this synthesis route were mild reaction conditions, simplified operational procedure and the raw materials were easy to obtain. It could be applied to industrial production.
- Wang, Peng,Ji, Min,Sha, Fei
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- Phosphorylamides, their preparation and use
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A phosphorylamide derivative represented by the general formula (I): STR1 wherein R represents an amino group that may be substituted, or a salt thereof, possesses potent antibacterial activity against Helicobacter bacterium, especially Helicobacter pylori, and is useful for prevention or treatment of digestive diseases caused by Helicobacter bacterium, solely or in combination with an antacid or an acid secretion inhibitor.
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- Herbicidal Thienylureas, I
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Syntheses of the title substances as potential herbicides are described by a modified Curtius degradation of corresponding thiophene carboxylic acids, obtained in turn by haloform reaction of appropriate acetyl thiophenes.Regioselective substitution reactions of thiophenes were key steps for the construction of desired substitution patterns.Structure-activity considerations show that especially the 3-thienyl ureas 36 and 38 exhibit significant herbicidal activity comparable with commercial products. - Keywords: Curtius degradation; Herbicides; Thiophenes; Ureas; Urethanes
- Stanetty, Peter,Puschautz, Erhard,Friedbacher, Gernot
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