A sequential procedure for the synthesis of 2,5-disubstituted thiazoles from terminal alkynes, sulfonyl azides, and thionoesters is reported. A copper(I)-catalyzed 1,3-dipolar cycloaddition of terminal alkynes with sulfonyl azides affords 1-sulfonyl-1,2,3-triazoles, which then react with thionoesters in the presence of a rhodium(II) catalyst. The resulting 3-sulfonyl-4-thiazolines subsequently aromatize
A Facile and Concise Synthesis of 2-Alkyl- and 2-Aryl-4-oxo- 4<i>H</i>thiopyrano[2,3-<i>b</i>]pyridines
作者:Axel Couture、Pierre Grandclaudon、Eric Huguerre
DOI:10.1055/s-1989-27288
日期:——
2-Alkyl- and 2-aryl-4-oxo-4H-thiopyrano[2,3-b]pyridine can be conveniently prepared by reacting the appropriate aromatic and aliphatic O-ethyl thiocarboxylates with the sodium derivative of various alkyl 3-(2-bromopyridyl) ketones.
Several oxazoles and thiazoles were synthesized easily by the reaction of N-(methylthioalkylidene)glycine ethyl ester with diethyl oxalate, acid halides, and thionesters in the presence of base.
Microwave-Accelerated Solvent-Free Synthesis of Thioketones, Thiolactones, Thioamides, Thionoesters, and Thioflavonoids
作者:Rajender S. Varma、Dalip Kumar
DOI:10.1021/ol990629a
日期:1999.9.1
[GRAPHICS]An expeditious, solvent free, and high yield conversion of ketones, flavones, isoflavones, lactones, amides, and esters to the corresponding thio analogues is described utilizing Lawesson's reagent in a process that circumvents the use of dry solvents and excess of the reagent.
A new synthetic route to the previously unattainable 2-arylpyrido[2,3-b][1,5]thiazepin-4(5H)-ones