99356-57-7Relevant academic research and scientific papers
A Trimethylsilylamine-Acyl Fluoride Amide Bond Forming Protocol for Weakly Nucleophilic Amines that is Amenable to the Parallel Synthesis of Di(hetero)arylamides
Zamiri, Maryam,Grierson, David S.
, p. 571 - 578 (2017)
The reaction of a 2-pyridinone-based acid fluoride with the N-TMS derivatives of different weakly nucleophilic heteroaryl/arylamines in acetonitrile containing catalytic fluoride ion provides a clean, efficient and simple means to access a diverse range of polar di(hetero)arylamide structures. This amide bond forming protocol is readily amenable to the parallel synthesis of compound libraries.
Synthesis of 4-Hydroxy-N--2-methyl-2H-1,2-benzothiazine-3-carboxamide 1,1-Dioxide and oxoacetic Acid. Major Metabolites of Isoxicam
Sircar, Jagadish C.,Capiris, Thomas,Bobovski, Thomas P.,Schwender, Charles F.
, p. 5723 - 5727 (2007/10/02)
4-Hydroxy-N--2-methyl-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide (2), the major oxidative human metabolite of isoxicam (1), and oxoacetic acid (3), the major rat metabolite of isoxicam (1), were synthesized. 2 was synthesized by condensation of the known benzothiazine ester 8 with the isoxazolamine 9b. 9b was synthesized via a nine-step sequence starting with 5-methyl-3-isoxazolecarboxylic acid (14).NBS bromination of 14 gave 5-(bromomethyl)-3-isoxazolecarboxylic acid, which was coverted to the carbamate ester via a Curtius rearrangement of the acid azide.Displacement of bromine with silver acetate gave the acetoxy compound 21.Hydrolysis of 21 gave the unstable 3-isoxazolamine derivative 9a, which was converted to the OSiMe3 derivative 9b.The compound 3 was synthesized by reaction of ethyl oxalyl chloride with 5-methyl-3-isoxazolamine followed by base hydrolysis.
