Synthesis of hetaryl-substituted 1,2,4-trithiolanes via a three-component reaction with dihetaryl thioketones, benzyl azide, and 2,2,4,4-tetramethyl-3-thioxocyclobutanone
作者:Grzegorz Mlostoń、Małgorzata Celeda、Anthony Linden、Heinz Heimgartner
DOI:10.1080/17415993.2015.1082182
日期:2016.1.2
The three-component reactions with a hetaryl thioketone, 2,2,4,4-tetramethyl-3-thioxocyclobutanone, and excess benzyl azide performed at 60 degrees C in the presence of LiClO4 lead to the formation of two types of 1,2,4-trithiolanes. As the major products, the non-symmetrical dihetaryl-substituted spiro-1,2,4-trithiolanes are formed. In addition, the symmetrical dispiro-1,2,4-trithiolane is identified. These products are formed in competitive [3 + 2] cycloadditions of the in-situ-generated thiocarbonyl S-sulfide with the thioketones used in the reaction.[GRAPHICS].