Synthesis, rearrangements, and fragmentation of ketene mercaptals derived from ketones or β-diketones and carbon disulphide
作者:L. Dalgaard、L. Jensen、S.-O. Lawesson
DOI:10.1016/s0040-4020(01)97222-9
日期:1974.1
By use of the ion pair extraction technique, tetrabutylammonium salts of acetylacetone, benzoylacetone, and dibenzoylmethane were reacted with carbon disulphide to give salts of dithioacids. Alkylation gave dithioesters and ketene mercaptals. A simple procedure for the preparation of 2-diacylmethylene-1,3-dithietanes was found. Cyclisation reactions of some acetylacetone derivatives gave a 1,3-dithiolane
通过使用离子对萃取技术,使乙酰丙酮,苯甲酰基丙酮和二苯甲酰基甲烷的四丁基铵盐与二硫化碳反应,生成二硫代酸盐。烷基化得到二硫酯和乙烯酮巯基。发现了制备2-二酰基亚甲基-1,3-二硫杂环丁烷的简单方法。一些乙酰丙酮衍生物的环化反应得到1,3-二噻吩,巯基噻吩和[2.3-b]噻吩并噻吩。衍生自丙酮,环己酮,乙酰丙酮,苯甲酰基丙酮和二苯甲酰基甲烷的烯丙基烯酮硫醇重排为α-烯丙基-二硫代酯。当乙烯酮硫醇基具有乙烯基氢时,观察到迁移的烯丙基反转。否则发现保留。3-[(巴豆硫基,甲硫基-亚甲基)亚甲基]乙酰丙酮在170°分解为甲基,1-甲基-烯丙基硫化物和“地精”:2,4-双-(二乙酰基-亚甲基)-1,3-二硫杂环丁烷。二硫代酯和乙烯酮硫醇合成的副产物包括三硫代碳酸酯,烷基化的β-二酮和由溶剂反应形成的化合物(CH2 Cl 2)与β-二酮或其二硫化碳加合物(1,3-二硫杂环丁烷)。