Sulfur-Containing Heterocycles Derived by Reaction of ?-Keto Amides withLawesson's Reagent
作者:Takehiko Nishio
DOI:10.1002/hlca.19980810531
日期:——
The reaction of ω-keto amides with Lawesson's reagent (LR: 2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide) is described. Treatment of 3-keto amides (2-acylacetamides) 1 with LR gave the corresponding 3-keto thioamides 2, along with 1,2-dithiole-3-thiones 3. Treatment of 4-keto amides, 3-acyl propionamides 5, with LR yielded five-membered heterocycles, pyrroles 6 and/or 2-aminothiophenes
描述了ω-酮酰胺与Lawesson试剂(LR:2,4-双(4-甲氧基苯基)-1,3,2,4-二硫代二膦烷2,4-二硫键)的反应。用LR处理3-酮酰胺(2-酰基乙酰胺)1得到相应的3-酮硫酰胺2,以及1,2-二硫代-3-硫酮3。用LR处理4-酮酰胺,3-酰基丙酰胺5,得到五元杂环,吡咯6和/或2-氨基噻吩7。5-酮基酰胺,3-苯甲酰基丁酰胺8与LR反应生成二氢噻喃-2-硫酮9作为唯一产品,但收率低。2-酰基苯甲酰胺10也与LR反应,得到3-巯基异吲哚啉-2-酮11或二氢异苯并噻吩-1-硫酮12。