Dithiazoles and related compounds. Part 3. Preparation of 5H-1,4,2-dithiazoles via 1,3-dipolar cycloadditions between nitrile sulphides and thiocarbonyl compounds, and some conversions into 3,5-diaryl-1,4,2-dithiazolium salts
作者:Kwok-Fai Wai、Michael P. Sammes
DOI:10.1039/p19910000183
日期:——
Thermolysis of 1,3,4 -oxathiazol-2-ones 3 in the presence of thiocarbonyl compounds gives modest to good yields of the little-known 5H-1,4,2-dithiazoles 1, the reaction being successful with diaryl, aryl alkyl and dialkyl ketones, and thiono esters, but failing with dithio esters and tertiary thioamides. The influence of substituents is discussed. Solvolysis of 5-ethoxy-5H-1,4,2-dithiazoles, derived
在硫代羰基化合物的存在下,对1,3,4-氧杂噻唑-2-酮3的热解反应可得到中等程度的中等收率的鲜为人知的5 H -1,4,2-二噻唑1,该反应可成功地与二芳基,芳基烷基和二烷基酮,以及硫代酸酯,但不能与二硫代酯和叔硫代酰胺结合使用。讨论了取代基的影响。5-乙氧基-5 H -1,4,2-二噻唑类化合物,由硫代酸酯衍生,与高氯酸在乙酸酐中溶剂化,可高产率生成3,5-二芳基-1,4,2-二噻唑鎓盐9。